diff --git a/dlls/winealsa.drv/mmdevdrv.c b/dlls/winealsa.drv/mmdevdrv.c
index ba29fde0198..0bedcc59177 100644
--- a/dlls/winealsa.drv/mmdevdrv.c
+++ b/dlls/winealsa.drv/mmdevdrv.c
@@ -117,7 +117,7 @@ struct ACImpl {
 
     HANDLE timer;
     BYTE *local_buffer, *tmp_buffer;
-    long getbuf_last; /* <0 when using tmp_buffer */
+    LONG32 getbuf_last; /* <0 when using tmp_buffer */
 
     CRITICAL_SECTION lock;
 
diff --git a/dlls/wineoss.drv/mmdevdrv.c b/dlls/wineoss.drv/mmdevdrv.c
index 650c46dacdd..22ee924f7af 100644
--- a/dlls/wineoss.drv/mmdevdrv.c
+++ b/dlls/wineoss.drv/mmdevdrv.c
@@ -121,7 +121,7 @@ struct ACImpl {
 
     BYTE *local_buffer, *tmp_buffer;
     int buf_state;
-    long getbuf_last; /* <0 when using tmp_buffer */
+    LONG32 getbuf_last; /* <0 when using tmp_buffer */
     HANDLE timer;
 
     CRITICAL_SECTION lock;