diff --git a/asterix-algebra/src/main/java/edu/uci/ics/asterix/optimizer/rules/typecast/StaticTypeCastUtil.java b/asterix-algebra/src/main/java/edu/uci/ics/asterix/optimizer/rules/typecast/StaticTypeCastUtil.java
index 5e59825..e5d6bfc 100644
--- a/asterix-algebra/src/main/java/edu/uci/ics/asterix/optimizer/rules/typecast/StaticTypeCastUtil.java
+++ b/asterix-algebra/src/main/java/edu/uci/ics/asterix/optimizer/rules/typecast/StaticTypeCastUtil.java
@@ -164,7 +164,7 @@
                 }
             }
             if (!compatible(reqType, inputType)) {
-                throw new AlgebricksException("type mistmach, required: " + reqType.toString() + " actual: "
+                throw new AlgebricksException("type mismatch, required: " + reqType.toString() + " actual: "
                         + inputType.toString());
             }
             return changed;