diff --git a/dlls/concrt140/concrt140.spec b/dlls/concrt140/concrt140.spec
index 44e0061f1346807030117f0c95313c98fc6bf2c1..4ba1825715e89f30c741bffbb30c121779e0782d 100644
--- a/dlls/concrt140/concrt140.spec
+++ b/dlls/concrt140/concrt140.spec
@@ -336,8 +336,8 @@
 @ thiscall -arch=i386 ?_DoYield@?$_SpinWait@$0A@@details@Concurrency@@IAEXXZ(ptr) msvcr120.?_DoYield@?$_SpinWait@$0A@@details@Concurrency@@IAEXXZ
 @ cdecl -arch=win64 ?_DoYield@?$_SpinWait@$0A@@details@Concurrency@@IEAAXXZ(ptr) msvcr120.?_DoYield@?$_SpinWait@$0A@@details@Concurrency@@IEAAXXZ
 @ cdecl ?_Get@_CurrentScheduler@details@Concurrency@@SA?AV_Scheduler@23@XZ(ptr) msvcr120.?_Get@_CurrentScheduler@details@Concurrency@@SA?AV_Scheduler@23@XZ
-@ stub -arch=win32 ?_GetCombinableSize@details@Concurrency@@YAIXZ
-@ stub -arch=win64 ?_GetCombinableSize@details@Concurrency@@YA_KXZ
+@ cdecl -arch=win32 ?_GetCombinableSize@details@Concurrency@@YAIXZ() msvcp120.?_GetCombinableSize@details@Concurrency@@YAIXZ
+@ cdecl -arch=win64 ?_GetCombinableSize@details@Concurrency@@YA_KXZ() msvcp120.?_GetCombinableSize@details@Concurrency@@YA_KXZ
 @ stub -arch=win32 ?_GetConcRTTraceInfo@Concurrency@@YAPBU_CONCRT_TRACE_INFO@details@1@XZ
 @ stub -arch=win64 ?_GetConcRTTraceInfo@Concurrency@@YAPEBU_CONCRT_TRACE_INFO@details@1@XZ
 @ cdecl ?_GetConcurrency@details@Concurrency@@YAIXZ() msvcr120.?_GetConcurrency@details@Concurrency@@YAIXZ
diff --git a/dlls/msvcp100/msvcp100.spec b/dlls/msvcp100/msvcp100.spec
index adfc7d794b66397e99c0cb4296424d56a0d1e8c6..74e1ccf64bfcfd5804352b5f9e6be86b25e71852 100644
--- a/dlls/msvcp100/msvcp100.spec
+++ b/dlls/msvcp100/msvcp100.spec
@@ -821,8 +821,8 @@
 @ cdecl -arch=win64 ?_Fput@?$num_put@GV?$ostreambuf_iterator@GU?$char_traits@G@std@@@std@@@std@@AEBA?AV?$ostreambuf_iterator@GU?$char_traits@G@std@@@2@V32@AEAVios_base@2@GPEBD_K333@Z(ptr ptr ptr ptr long str long long long long) num_put_short__Fput
 @ cdecl -arch=win32 ?_Fput@?$num_put@_WV?$ostreambuf_iterator@_WU?$char_traits@_W@std@@@std@@@std@@ABA?AV?$ostreambuf_iterator@_WU?$char_traits@_W@std@@@2@V32@AAVios_base@2@_WPBDIIII@Z(ptr ptr long ptr ptr long str long long long long) num_put_wchar__Fput
 @ cdecl -arch=win64 ?_Fput@?$num_put@_WV?$ostreambuf_iterator@_WU?$char_traits@_W@std@@@std@@@std@@AEBA?AV?$ostreambuf_iterator@_WU?$char_traits@_W@std@@@2@V32@AEAVios_base@2@_WPEBD_K444@Z(ptr ptr ptr ptr long str long long long long) num_put_wchar__Fput
-@ stub -arch=win32 ?_GetCombinableSize@details@Concurrency@@YAIXZ
-@ stub -arch=win64 ?_GetCombinableSize@details@Concurrency@@YA_KXZ
+@ cdecl -arch=win32 ?_GetCombinableSize@details@Concurrency@@YAIXZ() _GetCombinableSize
+@ cdecl -arch=win64 ?_GetCombinableSize@details@Concurrency@@YA_KXZ() _GetCombinableSize
 @ stub ?_GetCurrentThreadId@details@Concurrency@@YAKXZ
 @ cdecl -arch=win32 ?_Getcat@?$codecvt@DDH@std@@SAIPAPBVfacet@locale@2@PBV42@@Z(ptr ptr) codecvt_char__Getcat
 @ cdecl -arch=win64 ?_Getcat@?$codecvt@DDH@std@@SA_KPEAPEBVfacet@locale@2@PEBV42@@Z(ptr ptr) codecvt_char__Getcat
diff --git a/dlls/msvcp110/msvcp110.spec b/dlls/msvcp110/msvcp110.spec
index 8be2e170196e9d6b8955e0c02a1076358df06357..4d9d90b5f36009b5e6d7076b5c30234d51b869b4 100644
--- a/dlls/msvcp110/msvcp110.spec
+++ b/dlls/msvcp110/msvcp110.spec
@@ -1227,8 +1227,8 @@
 @ cdecl -arch=win64 ?_Fput@?$num_put@_WV?$ostreambuf_iterator@_WU?$char_traits@_W@std@@@std@@@std@@AEBA?AV?$ostreambuf_iterator@_WU?$char_traits@_W@std@@@2@V32@AEAVios_base@2@_WPEBD_K444@Z(ptr ptr ptr ptr long str long long long long) num_put_wchar__Fput
 @ stub -arch=win32 ?_Future_error_map@std@@YAPBDH@Z
 @ stub -arch=win64 ?_Future_error_map@std@@YAPEBDH@Z
-@ stub -arch=win32 ?_GetCombinableSize@details@Concurrency@@YAIXZ
-@ stub -arch=win64 ?_GetCombinableSize@details@Concurrency@@YA_KXZ
+@ cdecl -arch=win32 ?_GetCombinableSize@details@Concurrency@@YAIXZ() _GetCombinableSize
+@ cdecl -arch=win64 ?_GetCombinableSize@details@Concurrency@@YA_KXZ() _GetCombinableSize
 @ stub ?_GetCurrentThreadId@details@Concurrency@@YAKXZ
 @ stub ?_GetNextAsyncId@details@Concurrency@@YAIXZ
 @ stub -arch=win32 ?_Get_future_error_what@std@@YAPBDH@Z
diff --git a/dlls/msvcp120/msvcp120.spec b/dlls/msvcp120/msvcp120.spec
index bf2e35b49cb00c6d6c9f3319f661f0b13f66bfdd..4e0dbe4310c2afb96b48a9c9e05ec7ea64dea600 100644
--- a/dlls/msvcp120/msvcp120.spec
+++ b/dlls/msvcp120/msvcp120.spec
@@ -1192,8 +1192,8 @@
 @ cdecl -arch=win64 ?_Fput@?$num_put@_WV?$ostreambuf_iterator@_WU?$char_traits@_W@std@@@std@@@std@@AEBA?AV?$ostreambuf_iterator@_WU?$char_traits@_W@std@@@2@V32@AEAVios_base@2@_WPEBD_K444@Z(ptr ptr ptr ptr long str long long long long) num_put_wchar__Fput
 @ stub -arch=win32 ?_Future_error_map@std@@YAPBDH@Z
 @ stub -arch=win64 ?_Future_error_map@std@@YAPEBDH@Z
-@ stub -arch=win32 ?_GetCombinableSize@details@Concurrency@@YAIXZ
-@ stub -arch=win64 ?_GetCombinableSize@details@Concurrency@@YA_KXZ
+@ cdecl -arch=win32 ?_GetCombinableSize@details@Concurrency@@YAIXZ() _GetCombinableSize
+@ cdecl -arch=win64 ?_GetCombinableSize@details@Concurrency@@YA_KXZ() _GetCombinableSize
 @ cdecl -arch=win32 ?_Getcat@?$codecvt@DDH@std@@SAIPAPBVfacet@locale@2@PBV42@@Z(ptr ptr) codecvt_char__Getcat
 @ cdecl -arch=win64 ?_Getcat@?$codecvt@DDH@std@@SA_KPEAPEBVfacet@locale@2@PEBV42@@Z(ptr ptr) codecvt_char__Getcat
 @ cdecl -arch=win32 ?_Getcat@?$codecvt@GDH@std@@SAIPAPBVfacet@locale@2@PBV42@@Z(ptr ptr) codecvt_short__Getcat
diff --git a/dlls/msvcp120_app/msvcp120_app.spec b/dlls/msvcp120_app/msvcp120_app.spec
index aa1d654ee0ccf2a7dc363f53773594bc21c6d493..e548a29d1529e4cca5375fdec05bba8aeda4662f 100644
--- a/dlls/msvcp120_app/msvcp120_app.spec
+++ b/dlls/msvcp120_app/msvcp120_app.spec
@@ -1192,8 +1192,8 @@
 @ cdecl -arch=win64 ?_Fput@?$num_put@_WV?$ostreambuf_iterator@_WU?$char_traits@_W@std@@@std@@@std@@AEBA?AV?$ostreambuf_iterator@_WU?$char_traits@_W@std@@@2@V32@AEAVios_base@2@_WPEBD_K444@Z(ptr ptr ptr ptr long str long long long long) msvcp120.?_Fput@?$num_put@_WV?$ostreambuf_iterator@_WU?$char_traits@_W@std@@@std@@@std@@AEBA?AV?$ostreambuf_iterator@_WU?$char_traits@_W@std@@@2@V32@AEAVios_base@2@_WPEBD_K444@Z
 @ stub -arch=win32 ?_Future_error_map@std@@YAPBDH@Z
 @ stub -arch=win64 ?_Future_error_map@std@@YAPEBDH@Z
-@ stub -arch=win32 ?_GetCombinableSize@details@Concurrency@@YAIXZ
-@ stub -arch=win64 ?_GetCombinableSize@details@Concurrency@@YA_KXZ
+@ cdecl -arch=win32 ?_GetCombinableSize@details@Concurrency@@YAIXZ() msvcp120.?_GetCombinableSize@details@Concurrency@@YAIXZ
+@ cdecl -arch=win64 ?_GetCombinableSize@details@Concurrency@@YA_KXZ() msvcp120.?_GetCombinableSize@details@Concurrency@@YA_KXZ
 @ cdecl -arch=win32 ?_Getcat@?$codecvt@DDH@std@@SAIPAPBVfacet@locale@2@PBV42@@Z(ptr ptr) msvcp120.?_Getcat@?$codecvt@DDH@std@@SAIPAPBVfacet@locale@2@PBV42@@Z
 @ cdecl -arch=win64 ?_Getcat@?$codecvt@DDH@std@@SA_KPEAPEBVfacet@locale@2@PEBV42@@Z(ptr ptr) msvcp120.?_Getcat@?$codecvt@DDH@std@@SA_KPEAPEBVfacet@locale@2@PEBV42@@Z
 @ cdecl -arch=win32 ?_Getcat@?$codecvt@GDH@std@@SAIPAPBVfacet@locale@2@PBV42@@Z(ptr ptr) msvcp120.?_Getcat@?$codecvt@GDH@std@@SAIPAPBVfacet@locale@2@PBV42@@Z
diff --git a/dlls/msvcp90/misc.c b/dlls/msvcp90/misc.c
index ae7a129fd45d02bb2a520af0532407935f7bfb9e..c5079d716927160dd5810be8fef40c80bf0bd10e 100644
--- a/dlls/msvcp90/misc.c
+++ b/dlls/msvcp90/misc.c
@@ -2578,6 +2578,14 @@ MSVCP_bool __cdecl is_current_task_group_canceling(void)
 {
     return Context_IsCurrentTaskCollectionCanceling();
 }
+
+/* ?_GetCombinableSize@details@Concurrency@@YAIXZ */
+/* ?_GetCombinableSize@details@Concurrency@@YA_KXZ */
+MSVCP_size_t __cdecl _GetCombinableSize(void)
+{
+    FIXME("() stub\n");
+    return 11;
+}
 #endif
 
 #if _MSVCP_VER >= 140