diff --git a/src/modal.c b/src/modal.c
index e4f5b6f..7bce9ef 100644
--- a/src/modal.c
+++ b/src/modal.c
@@ -34,10 +34,11 @@ walk(char *s)
 static int
 sint(char *s)
 {
-	int r = 0;
 	char c;
+	int r = 0, n = 1;
+	if(*s == '-') { n = -1, s++; }
 	while((c = *s++) && c > 0x20) r = r * 10 + c - '0';
-	return r;
+	return r * n;
 }
 
 static void