diff --git a/src/fix/main.c b/src/fix/main.c
index 36cc2df9..32ed3db5 100644
--- a/src/fix/main.c
+++ b/src/fix/main.c
@@ -390,12 +390,11 @@ main(int argc, char *argv[])
 			headbyte++;
 		}
 
-		while (newsize != ftell(rom)) /* ROM needs resizing */
-			fputc(padvalue, rom);
-
 		if (newsize > 0x800000) /* ROM is bigger than 8MiB */
 			fprintf(stderr, "ROM size is bigger than 8MiB\n");
 
+		ftruncate(fileno(rom), newsize);
+
 		fseek(rom, 0x148, SEEK_SET);
 		fputc(headbyte, rom);
 	}