diff --git a/dlls/gdi32/driver.c b/dlls/gdi32/driver.c
index 635eeb8e33d..639e4a8000d 100644
--- a/dlls/gdi32/driver.c
+++ b/dlls/gdi32/driver.c
@@ -750,6 +750,9 @@ INT WINAPI NamedEscape( HDC hdc, LPCWSTR pDriver, INT nEscape, INT cbInput, LPCS
  */
 ULONG WINAPI DdQueryDisplaySettingsUniqueness(VOID)
 {
-    FIXME("stub\n");
+    static int warn_once;
+
+    if (!warn_once++)
+        FIXME("stub\n");
     return 0;
 }
diff --git a/dlls/ntdll/rtl.c b/dlls/ntdll/rtl.c
index d4a704500b7..301b30c4f81 100644
--- a/dlls/ntdll/rtl.c
+++ b/dlls/ntdll/rtl.c
@@ -444,7 +444,10 @@ PVOID WINAPI RtlInitializeGenericTable(PVOID pTable, PVOID arg2, PVOID arg3, PVO
  */
 PVOID RtlEnumerateGenericTableWithoutSplaying(PVOID pTable, PVOID *RestartKey)
 {
-    FIXME("(%p,%p) stub!\n", pTable, RestartKey);
+    static int warn_once;
+
+    if (!warn_once++)
+        FIXME("(%p,%p) stub!\n", pTable, RestartKey);
     return NULL;
 }