diff --git a/tests/ImageTensorGenerator/ImageTensorGenerator.cpp b/tests/ImageTensorGenerator/ImageTensorGenerator.cpp
index 0f1cf6d..d4a2103 100644
--- a/tests/ImageTensorGenerator/ImageTensorGenerator.cpp
+++ b/tests/ImageTensorGenerator/ImageTensorGenerator.cpp
@@ -264,7 +264,7 @@
         }
         else
         {
-            throw armnn::Exception("Unsupported input type" + m_OutputType);
+            throw armnn::Exception("Unsupported input type " + m_OutputType);
         }
     }