diff --git a/dirot.c b/dirot.c
index bdb1246..9f3014d 100644
--- a/dirot.c
+++ b/dirot.c
@@ -12,11 +12,12 @@ void test_and_fail(void *ptr, char *msg) {
 	}
 }
 
-int ror4 (int x) {
-	// Just rotate right by 1 bit
+int rol4 (int x) {
+	// Just rotate left by 1 bit
 	int num = x & 0xf;
-	int lowbit = x & 0x1;
-	return (num >> 1) | (lowbit << 3);
+	int sh = num << 1;
+	int overflow = (sh & 0x10) >> 4;
+	return (sh & 0xf) | overflow;
 }
 
 int main (void) {
@@ -33,7 +34,7 @@ int main (void) {
 	Rotation all;
 	all = XRRRotations(dpy, screen_number, &current);
 
-	Rotation new = ror4(current);
+	Rotation new = rol4(current);
 
 	Time cfg_ts;
 	Rotation cfg_rot;