diff --git a/fuzz/src/main/java/edu/berkeley/cs/jqf/fuzz/junit/quickcheck/FastSourceOfRandomness.java b/fuzz/src/main/java/edu/berkeley/cs/jqf/fuzz/junit/quickcheck/FastSourceOfRandomness.java
index fd456e99c..c32d74742 100644
--- a/fuzz/src/main/java/edu/berkeley/cs/jqf/fuzz/junit/quickcheck/FastSourceOfRandomness.java
+++ b/fuzz/src/main/java/edu/berkeley/cs/jqf/fuzz/junit/quickcheck/FastSourceOfRandomness.java
@@ -110,7 +110,7 @@ public long nextLong(long min, long max) {
     }
 
     private int fastChooseIntInRange(int min, int max) {
-        int range = max - min;
+        int range = max - min + 1;
 
         // If range is too wide, overflow will make it negative
         if (range > 0) {