diff --git a/ui/helpers.c b/ui/helpers.c
index db71972..5d71275 100644
--- a/ui/helpers.c
+++ b/ui/helpers.c
@@ -75,7 +75,8 @@ char * hex_to_bitmap(char hex_digit) {
 
 	char *bitmap = malloc(5 * sizeof(char));
 	bitmap[4] = '\0';
-	for(int i = 3; i >= 0; i--) {
+	int i;
+	for(i = 3; i >= 0; i--) {
 		bitmap[i] = digit % 2 ? '1' : '0';
 		digit /= 2;
 	}