1 files changed, 5 insertions, 0 deletions
diff --git a/src/main/java/org/zwobble/couscous/ast/TypeName.java b/src/main/java/org/zwobble/couscous/ast/TypeName.java
index e25f911..4ff70ed 100644
--- a/src/main/java/org/zwobble/couscous/ast/TypeName.java
+++ b/src/main/java/org/zwobble/couscous/ast/TypeName.java
@@ -1,7 +1,12 @@
 package org.zwobble.couscous.ast;
 
+import com.google.common.base.Strings;
+
 public class TypeName {
     public static TypeName of(String qualifiedName) {
+        if (Strings.isNullOrEmpty(qualifiedName)) {
+            throw new IllegalArgumentException("qualifiedName cannot be blank");
+        }
         return new TypeName(qualifiedName);
     }