diff --git a/dlls/vcomp/main.c b/dlls/vcomp/main.c
index 82c8c94e312..1e51eef071e 100644
--- a/dlls/vcomp/main.c
+++ b/dlls/vcomp/main.c
@@ -41,6 +41,11 @@ double CDECL omp_get_wtime(void)
     return GetTickCount() / 1000.0;
 }
 
+void CDECL _vcomp_set_num_threads(int num_threads)
+{
+    TRACE("(%d): stub\n", num_threads);
+}
+
 BOOL WINAPI DllMain(HINSTANCE hinstDLL, DWORD fdwReason, LPVOID lpvReserved)
 {
     TRACE("(0x%p, %d, %p)\n", hinstDLL, fdwReason, lpvReserved);
diff --git a/dlls/vcomp/vcomp.spec b/dlls/vcomp/vcomp.spec
index 7a701ef471b..3e02bea9ca7 100644
--- a/dlls/vcomp/vcomp.spec
+++ b/dlls/vcomp/vcomp.spec
@@ -85,7 +85,7 @@
 @ stub _vcomp_reduction_u8
 @ stub _vcomp_sections_init
 @ stub _vcomp_sections_next
-@ stub _vcomp_set_num_threads
+@ cdecl _vcomp_set_num_threads(long)
 @ stub _vcomp_single_begin
 @ stub _vcomp_single_end
 @ stub omp_destroy_lock