diff --git a/dlls/concrt140/concrt140.spec b/dlls/concrt140/concrt140.spec
index d510a3b9371..855e36628cf 100644
--- a/dlls/concrt140/concrt140.spec
+++ b/dlls/concrt140/concrt140.spec
@@ -239,8 +239,8 @@
 @ stub -arch=win64 ?Detach@CurrentScheduler@Concurrency@@SAXXZ
 @ stub -arch=win64 ?DisableTracing@Concurrency@@YAJXZ
 @ stub -arch=win64 ?EnableTracing@Concurrency@@YAJXZ
-@ stub -arch=win32 ?Free@Concurrency@@YAXPAX@Z
-@ stub -arch=win64 ?Free@Concurrency@@YAXPEAX@Z
+@ cdecl -arch=win32 ?Free@Concurrency@@YAXPAX@Z(ptr) msvcr120.?Free@Concurrency@@YAXPAX@Z
+@ cdecl -arch=win64 ?Free@Concurrency@@YAXPEAX@Z(ptr) msvcr120.?Free@Concurrency@@YAXPEAX@Z
 @ stub -arch=win32 ?Get@CurrentScheduler@Concurrency@@SAPAVScheduler@2@XZ
 @ stub -arch=win64 ?Get@CurrentScheduler@Concurrency@@SAPEAVScheduler@2@XZ
 @ stub -arch=win64 ?GetExecutionContextId@Concurrency@@YAIXZ
diff --git a/dlls/msvcr100/msvcr100.spec b/dlls/msvcr100/msvcr100.spec
index 38753047980..d60c2c2dd96 100644
--- a/dlls/msvcr100/msvcr100.spec
+++ b/dlls/msvcr100/msvcr100.spec
@@ -258,8 +258,8 @@
 @ stub ?Detach@CurrentScheduler@Concurrency@@SAXXZ
 @ stub ?DisableTracing@Concurrency@@YAJXZ
 @ stub ?EnableTracing@Concurrency@@YAJXZ
-@ stub -arch=win32 ?Free@Concurrency@@YAXPAX@Z
-@ stub -arch=win64 ?Free@Concurrency@@YAXPEAX@Z
+@ cdecl -arch=win32 ?Free@Concurrency@@YAXPAX@Z(ptr) Concurrency_Free
+@ cdecl -arch=win64 ?Free@Concurrency@@YAXPEAX@Z(ptr) Concurrency_Free
 @ stub -arch=win32 ?Get@CurrentScheduler@Concurrency@@SAPAVScheduler@2@XZ
 @ stub -arch=win64 ?Get@CurrentScheduler@Concurrency@@SAPEAVScheduler@2@XZ
 @ stub ?GetExecutionContextId@Concurrency@@YAIXZ
diff --git a/dlls/msvcr110/msvcr110.spec b/dlls/msvcr110/msvcr110.spec
index 4026b1baed7..f9b6613dfca 100644
--- a/dlls/msvcr110/msvcr110.spec
+++ b/dlls/msvcr110/msvcr110.spec
@@ -418,8 +418,8 @@
 @ stub ?Detach@CurrentScheduler@Concurrency@@SAXXZ
 @ stub ?DisableTracing@Concurrency@@YAJXZ
 @ stub ?EnableTracing@Concurrency@@YAJXZ
-@ stub -arch=win32 ?Free@Concurrency@@YAXPAX@Z
-@ stub -arch=win64 ?Free@Concurrency@@YAXPEAX@Z
+@ cdecl -arch=win32 ?Free@Concurrency@@YAXPAX@Z(ptr) Concurrency_Free
+@ cdecl -arch=win64 ?Free@Concurrency@@YAXPEAX@Z(ptr) Concurrency_Free
 @ stub -arch=win32 ?Get@CurrentScheduler@Concurrency@@SAPAVScheduler@2@XZ
 @ stub -arch=win64 ?Get@CurrentScheduler@Concurrency@@SAPEAVScheduler@2@XZ
 @ stub ?GetExecutionContextId@Concurrency@@YAIXZ
diff --git a/dlls/msvcr120/msvcr120.spec b/dlls/msvcr120/msvcr120.spec
index 27c800ba7d6..48129f6042e 100644
--- a/dlls/msvcr120/msvcr120.spec
+++ b/dlls/msvcr120/msvcr120.spec
@@ -416,8 +416,8 @@
 @ stub ?Detach@CurrentScheduler@Concurrency@@SAXXZ
 @ stub ?DisableTracing@Concurrency@@YAJXZ
 @ stub ?EnableTracing@Concurrency@@YAJXZ
-@ stub -arch=win32 ?Free@Concurrency@@YAXPAX@Z
-@ stub -arch=win64 ?Free@Concurrency@@YAXPEAX@Z
+@ cdecl -arch=win32 ?Free@Concurrency@@YAXPAX@Z(ptr) Concurrency_Free
+@ cdecl -arch=win64 ?Free@Concurrency@@YAXPEAX@Z(ptr) Concurrency_Free
 @ stub -arch=win32 ?Get@CurrentScheduler@Concurrency@@SAPAVScheduler@2@XZ
 @ stub -arch=win64 ?Get@CurrentScheduler@Concurrency@@SAPEAVScheduler@2@XZ
 @ stub ?GetCurrentThreadId@platform@details@Concurrency@@YAJXZ
diff --git a/dlls/msvcr120_app/msvcr120_app.spec b/dlls/msvcr120_app/msvcr120_app.spec
index dcb391c9465..7242cb9a9b6 100644
--- a/dlls/msvcr120_app/msvcr120_app.spec
+++ b/dlls/msvcr120_app/msvcr120_app.spec
@@ -412,8 +412,8 @@
 @ stub ?Detach@CurrentScheduler@Concurrency@@SAXXZ
 @ stub ?DisableTracing@Concurrency@@YAJXZ
 @ stub ?EnableTracing@Concurrency@@YAJXZ
-@ stub -arch=win32 ?Free@Concurrency@@YAXPAX@Z
-@ stub -arch=win64 ?Free@Concurrency@@YAXPEAX@Z
+@ cdecl -arch=win32 ?Free@Concurrency@@YAXPAX@Z(ptr) msvcr120.?Free@Concurrency@@YAXPAX@Z
+@ cdecl -arch=win64 ?Free@Concurrency@@YAXPEAX@Z(ptr) msvcr120.?Free@Concurrency@@YAXPEAX@Z
 @ stub -arch=win32 ?Get@CurrentScheduler@Concurrency@@SAPAVScheduler@2@XZ
 @ stub -arch=win64 ?Get@CurrentScheduler@Concurrency@@SAPEAVScheduler@2@XZ
 @ stub ?GetCurrentThreadId@platform@details@Concurrency@@YAJXZ
diff --git a/dlls/msvcrt/heap.c b/dlls/msvcrt/heap.c
index f99f9c3e6c7..ba07bb04e4d 100644
--- a/dlls/msvcrt/heap.c
+++ b/dlls/msvcrt/heap.c
@@ -873,3 +873,11 @@ void * CDECL Concurrency_Alloc(MSVCRT_size_t size)
     FIXME("(%ld) returning %p\n", size, p);
     return p;
 }
+
+/* ?Free@Concurrency@@YAXPAX@Z */
+/* ?Free@Concurrency@@YAXPEAX@Z */
+void CDECL Concurrency_Free(void* mem)
+{
+    FIXME("(%p) stub\n", mem);
+    MSVCRT_free(mem);
+}