diff --git a/clazy.cmake b/clazy.cmake
--- a/clazy.cmake
+++ b/clazy.cmake
@@ -112,17 +112,17 @@
   ExtraClangOptions="-Xclang -plugin-arg-clazy -Xclang visit-implicit-code"
 fi
 
-if [[ $CLAZY_CHECKS == *"jni-signatures"* ]]
-then
-
-    if [[ -z $ANDROID_NDK ]]
+case "$CLAZY_CHECKS" in
+  *jni-signatures*)
+    if [ -z "$ANDROID_NDK" ]
     then
         echo "To test JNI signatures you need to set ANDROID_NDK to your Android NDK installation."
         exit
     fi
 
     ExtraClangOptions=$ExtraClangOptions" -idirafter"$ANDROID_NDK"/sysroot/usr/include"
-fi
+  ;;
+esac
 
 ClazyPluginLib=ClazyPlugin@CMAKE_SHARED_LIBRARY_SUFFIX@