diff --git a/src/lib/portmidi/pmutil.c b/src/lib/portmidi/pmutil.c
index a70fe2fa1f8..7d0abe35337 100644
--- a/src/lib/portmidi/pmutil.c
+++ b/src/lib/portmidi/pmutil.c
@@ -8,7 +8,7 @@
 #include "pmutil.h"
 #include "pminternal.h"
 
-#ifdef WIN32
+#if defined(WIN32) || defined(_MSC_VER)
 #define bzero(addr, siz) memset(addr, 0, siz)
 #endif
 
diff --git a/src/lib/portmidi/pmwinmm.c b/src/lib/portmidi/pmwinmm.c
index 5303ed4c4dd..9921b1af8e6 100644
--- a/src/lib/portmidi/pmwinmm.c
+++ b/src/lib/portmidi/pmwinmm.c
@@ -207,7 +207,7 @@ static void pm_winmm_mapper_input(void)
                             sizeof(MIDIINCAPS));
     if (wRtn == MMSYSERR_NOERROR) {
         pm_add_device((char *)"MMSystem", midi_in_mapper_caps.szPname, TRUE,
-                      (void *) MIDIMAPPER, &pm_winmm_in_dictionary);
+                      (void *)(FPTR)MIDIMAPPER, &pm_winmm_in_dictionary);
     }
 }
 
@@ -246,7 +246,7 @@ static void pm_winmm_mapper_output(void)
                              & midi_out_mapper_caps, sizeof(MIDIOUTCAPS));
     if (wRtn == MMSYSERR_NOERROR) {
         pm_add_device((char *)"MMSystem", midi_out_mapper_caps.szPname, FALSE,
-                      (void *) MIDIMAPPER, &pm_winmm_out_dictionary);
+                      (void *)(FPTR)MIDIMAPPER, &pm_winmm_out_dictionary);
     }
 }