diff --git a/core/src/main/java/com/ibm/wala/ssa/SSACFG.java b/core/src/main/java/com/ibm/wala/ssa/SSACFG.java
index 6301c08b1..c10e398b1 100644
--- a/core/src/main/java/com/ibm/wala/ssa/SSACFG.java
+++ b/core/src/main/java/com/ibm/wala/ssa/SSACFG.java
@@ -472,10 +472,9 @@ public boolean hasNext() {
         @Override
         public SSAInstruction next() {
           SSAInstruction i = instructions[start];
-          start++;
-          while (start <= end && instructions[start] == null) {
+          do {
             start++;
-          }
+          } while (start <= end && instructions[start] == null);
           return i;
         }