diff --git a/dlls/winmm/winmm.c b/dlls/winmm/winmm.c
index 4bce7f07d29..97a67941483 100644
--- a/dlls/winmm/winmm.c
+++ b/dlls/winmm/winmm.c
@@ -167,6 +167,15 @@ const char* WINMM_ErrorToString(MMRESULT error)
     ERR_TO_STR(MMSYSERR_BADERRNUM);
     ERR_TO_STR(MMSYSERR_INVALFLAG);
     ERR_TO_STR(MMSYSERR_INVALPARAM);
+    ERR_TO_STR(MMSYSERR_HANDLEBUSY);
+    ERR_TO_STR(MMSYSERR_INVALIDALIAS);
+    ERR_TO_STR(MMSYSERR_BADDB);
+    ERR_TO_STR(MMSYSERR_KEYNOTFOUND);
+    ERR_TO_STR(MMSYSERR_READERROR);
+    ERR_TO_STR(MMSYSERR_WRITEERROR);
+    ERR_TO_STR(MMSYSERR_DELETEERROR);
+    ERR_TO_STR(MMSYSERR_VALNOTFOUND);
+    ERR_TO_STR(MMSYSERR_NODRIVERCB);
     ERR_TO_STR(WAVERR_BADFORMAT);
     ERR_TO_STR(WAVERR_STILLPLAYING);
     ERR_TO_STR(WAVERR_UNPREPARED);