diff --git a/Code/Mantid/Build/Jenkins/buildscript b/Code/Mantid/Build/Jenkins/buildscript
index d8a8172fcaf5..49d3bbefff97 100755
--- a/Code/Mantid/Build/Jenkins/buildscript
+++ b/Code/Mantid/Build/Jenkins/buildscript
@@ -21,10 +21,12 @@ if [[ ${JOB_NAME} == *clang* ]]; then
   clang --version
   export CC=clang
   export CXX=clang++
-  COMPILERFILEPATH=`grep 'CMAKE_CXX_COMPILER:FILEPATH' $WORKSPACE/build/CMakeCache.txt 2>/dev/null` 
-  if [[ $COMPILERFILEPATH != *clang++* ]]; then 
-    # Removing the build directory entirely guarantees clang is used.
-    rm -rf $WORKSPACE/build
+  if [[ -e $WORKSPACE/build/CMakeCache.txt ]]; then
+    COMPILERFILEPATH=`grep 'CMAKE_CXX_COMPILER:FILEPATH' $WORKSPACE/build/CMakeCache.txt` 
+    if [[ $COMPILERFILEPATH != *clang++* ]]; then 
+      # Removing the build directory entirely guarantees clang is used.
+      rm -rf $WORKSPACE/build
+    fi
   fi 
 fi