diff --git a/CMakeLists.txt b/CMakeLists.txt
index 198aa7addb8ad64c8124dd02166dc2022fac1576..07096244b1803817724d6ede91cbcde356860b66 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1223,7 +1223,7 @@ if(CMAKE_COMPILER_IS_GNUCXX)
     endif()
 
     if(X86 OR X86_64)
-        if(NOT APPLE AND ${CMAKE_SIZEOF_VOID_P} EQUAL 4)
+        if(NOT APPLE AND CMAKE_SIZEOF_VOID_P EQUAL 4)
             set(EXTRA_C_FLAGS_RELEASE "${EXTRA_C_FLAGS_RELEASE} -mfpmath=387")
         endif()
     endif()