diff --git a/src/backends/reference/workloads/RefL2NormalizationFloat32Workload.cpp b/src/backends/reference/workloads/RefL2NormalizationFloat32Workload.cpp
index d21cfa9..bc82739 100644
--- a/src/backends/reference/workloads/RefL2NormalizationFloat32Workload.cpp
+++ b/src/backends/reference/workloads/RefL2NormalizationFloat32Workload.cpp
@@ -12,6 +12,8 @@
 
 #include <cmath>
 
+using namespace armnnUtils;
+
 namespace armnn
 {