diff --git a/src/m_anigif.c b/src/m_anigif.c
index d46d889b..e2af7009 100644
--- a/src/m_anigif.c
+++ b/src/m_anigif.c
@@ -492,7 +492,7 @@ static void GIF_framewrite(void)
 
 	// screen regions are handled in GIF_lzw
 	{
-		int d1 = (int)((100.0/NEWTICRATE)*gif_frames+1);
+		int d1 = (int)((100.0/NEWTICRATE)*(gif_frames+1));
 		int d2 = (int)((100.0/NEWTICRATE)*(gif_frames));
 		UINT16 delay = d1-d2;
 		INT32 startline;