diff --git a/dlls/vcomp/main.c b/dlls/vcomp/main.c
index 34baf6e4a3d..38b76da9423 100644
--- a/dlls/vcomp/main.c
+++ b/dlls/vcomp/main.c
@@ -96,6 +96,17 @@ void CDECL _vcomp_set_num_threads(int num_threads)
     TRACE("(%d): stub\n", num_threads);
 }
 
+int CDECL _vcomp_single_begin(int flags)
+{
+    TRACE("(%x): stub\n", flags);
+    return TRUE;
+}
+
+void CDECL _vcomp_single_end(void)
+{
+    TRACE("stub\n");
+}
+
 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 21e3ff9e1d7..306dd152959 100644
--- a/dlls/vcomp/vcomp.spec
+++ b/dlls/vcomp/vcomp.spec
@@ -86,8 +86,8 @@
 @ stub _vcomp_sections_init
 @ stub _vcomp_sections_next
 @ cdecl _vcomp_set_num_threads(long)
-@ stub _vcomp_single_begin
-@ stub _vcomp_single_end
+@ cdecl _vcomp_single_begin(long)
+@ cdecl _vcomp_single_end()
 @ stub omp_destroy_lock
 @ stub omp_destroy_nest_lock
 @ cdecl omp_get_dynamic()
diff --git a/dlls/vcomp100/vcomp100.spec b/dlls/vcomp100/vcomp100.spec
index da1bad65c04..39cf91c2547 100644
--- a/dlls/vcomp100/vcomp100.spec
+++ b/dlls/vcomp100/vcomp100.spec
@@ -86,8 +86,8 @@
 @ stub _vcomp_sections_init
 @ stub _vcomp_sections_next
 @ cdecl _vcomp_set_num_threads(long) vcomp._vcomp_set_num_threads
-@ stub _vcomp_single_begin
-@ stub _vcomp_single_end
+@ cdecl _vcomp_single_begin(long) vcomp._vcomp_single_begin
+@ cdecl _vcomp_single_end() vcomp._vcomp_single_end
 @ stub omp_destroy_lock
 @ stub omp_destroy_nest_lock
 @ cdecl omp_get_dynamic() vcomp.omp_get_dynamic
diff --git a/dlls/vcomp90/vcomp90.spec b/dlls/vcomp90/vcomp90.spec
index da1bad65c04..39cf91c2547 100644
--- a/dlls/vcomp90/vcomp90.spec
+++ b/dlls/vcomp90/vcomp90.spec
@@ -86,8 +86,8 @@
 @ stub _vcomp_sections_init
 @ stub _vcomp_sections_next
 @ cdecl _vcomp_set_num_threads(long) vcomp._vcomp_set_num_threads
-@ stub _vcomp_single_begin
-@ stub _vcomp_single_end
+@ cdecl _vcomp_single_begin(long) vcomp._vcomp_single_begin
+@ cdecl _vcomp_single_end() vcomp._vcomp_single_end
 @ stub omp_destroy_lock
 @ stub omp_destroy_nest_lock
 @ cdecl omp_get_dynamic() vcomp.omp_get_dynamic