diff --git a/c/ABCD.c b/c/ABCD.c
index ac1c91f..2f4f133 100644
--- a/c/ABCD.c
+++ b/c/ABCD.c
@@ -3,7 +3,7 @@
 
 int main(void)
 {
-    int speed = 200;
+    int speed = 100;
 
     printf("motor start speed = %d\n", speed);