diff --git a/dda.c b/dda.c
index 131c7fa..2f12cdf 100644
--- a/dda.c
+++ b/dda.c
@@ -104,7 +104,9 @@ uint32_t approx_distance_3( uint32_t dx, uint32_t dy, uint32_t dz )
 uint16_t int_sqrt(uint32_t a) {
 	uint32_t rem = 0;
 	uint32_t root = 0;
-	for (uint16_t i = 0; i < 16; i++) {
+	uint16_t i;
+
+	for (i = 0; i < 16; i++) {
 		root <<= 1;
 		rem = ((rem << 2) + (a >> 30));
 		a <<= 2;