diff --git a/Source/missiles.cpp b/Source/missiles.cpp
index 7e962c44c..5854ceccf 100644
--- a/Source/missiles.cpp
+++ b/Source/missiles.cpp
@@ -2132,7 +2132,7 @@ void AddInfra(int mi, int sx, int sy, int dx, int dy, int midir, char mienemy, i
 	int i;
 
 	missile[mi]._mirange = 1584;
-	for (i = 0; i < missile[mi]._mispllvl; i++) {
+	for (i = missile[mi]._mispllvl; i > 0; i--) {
 		missile[mi]._mirange += missile[mi]._mirange >> 3;
 	}
 	missile[mi]._mirange += missile[mi]._mirange * plr[id]._pISplDur >> 7;