diff --git a/code/CMakeLists.txt b/code/CMakeLists.txt
index a677269f0..2c48f3742 100644
--- a/code/CMakeLists.txt
+++ b/code/CMakeLists.txt
@@ -47,7 +47,7 @@
 cmake_minimum_required( VERSION 2.6 )
 SET( HEADER_PATH ../include/assimp )
 
-if(NOT (ANDROID AND ASSIMP_ANDROID_JNIIOSYSTEM))
+if(NOT ANDROID AND ASSIMP_ANDROID_JNIIOSYSTEM)
     message(WARNING "Requesting Android JNI I/O-System in non-Android toolchain. Resetting ASSIMP_ANDROID_JNIIOSYSTEM to OFF.")
     set(ASSIMP_ANDROID_JNIIOSYSTEM OFF)
 endif(NOT (ANDROID AND ASSIMP_ANDROID_JNIIOSYSTEM))