diff --git a/du1/program.c b/du1/program.c
index aed8f22..c5cf368 100644
--- a/du1/program.c
+++ b/du1/program.c
@@ -5,7 +5,7 @@ while((r = getchar()) !=EOF && r){
 	if(r >= 'a' && r <= 'z'){
 	r = 'a' + 'A';
 }
-	else if(c >= 'A' && c <= 'Z'){
+	else if(r >= 'A' && r <= 'Z'){
 		r = 'A' + 'Z';
 	}
 }