diff --git a/src/RdBitF.c b/src/RdBitF.c
index e5a8592e..ce370806 100644
--- a/src/RdBitF.c
+++ b/src/RdBitF.c
@@ -134,7 +134,7 @@ XReadBitmapFileData (
 
     /* error cleanup and return macro	*/
 #define	RETURN(code) \
-{ Xfree (bits); fclose (fstream); return code; }
+    do { Xfree (bits); fclose (fstream); return code; } while (0)
 
     while (fgets(line, MAX_SIZE, fstream)) {
 	if (strlen(line) == MAX_SIZE-1)