diff --git a/Source/WebKit/PlatformGTK.cmake b/Source/WebKit/PlatformGTK.cmake
index 6b4dd14806a8..902a1d8577b2 100644
--- a/Source/WebKit/PlatformGTK.cmake
+++ b/Source/WebKit/PlatformGTK.cmake
@@ -369,7 +369,7 @@ if (ENABLE_MEDIA_STREAM)
     )
 endif ()
 
-if (${GI_VERSION} VERSION_GREATER_EQUAL 1.79.2)
+if ("${GI_VERSION}" VERSION_GREATER_EQUAL 1.79.2)
     set(USE_GI_FINISH_FUNC_ANNOTATION 1)
 else ()
     set(USE_GI_FINISH_FUNC_ANNOTATION 0)