diff --git a/java-latest-openjdk-portable.spec b/java-latest-openjdk-portable.spec
index 7cf8b03..f9e2091 100644
--- a/java-latest-openjdk-portable.spec
+++ b/java-latest-openjdk-portable.spec
@@ -1301,15 +1301,16 @@ function findGeneratedSources() {
   local sourcesName=$(basename ${sources})
   local sourcesParent=$(dirname ${sources})
   local target=${sourcesParent}/${targetDirParent}/%{generated_sources_name}
-  local suffixes="cpp|hpp|h|hh|rl"
+  local suffixes="cpp\|hpp\|h\|hh\|rl"
+  suffixes=".*\.\($suffixes\)$"
   mkdir -p $target
   pushd ${builtJdk}
     mkdir -p ${target}/${builtJdkName}
-    cp --parents $(find . | grep -e ".*\.($suffixes)$" -e "NONE$") ${target}/${builtJdkName}
+    cp --parents $(find . | grep -e "$suffixes" -e "NONE$") ${target}/${builtJdkName}
   popd
   pushd ${sources}
     mkdir -p ${target}/${sourcesName}
-    cp --parents $(find make | grep -e -e ".*\.($suffixes)$" -e "NONE$") ${target}/${sourcesName}
+    cp --parents $(find make | grep -e ".$suffixes" -e "NONE$") ${target}/${sourcesName}
   popd
 }