diff --git a/cmake_modules/purpleConfig.cmake b/cmake_modules/purpleConfig.cmake
index 72ff99fd536ec05217c60c6cbf16d635b18ac8e0..96f58a196c3ec594da318f4dfaa195576bcbcb67 100644
--- a/cmake_modules/purpleConfig.cmake
+++ b/cmake_modules/purpleConfig.cmake
@@ -2,9 +2,9 @@ FIND_LIBRARY(PURPLE_LIBRARY NAMES purple)
 FIND_PATH(PURPLE_INCLUDE_DIR NAMES "purple.h" PATH_SUFFIXES libpurple )
 
 if(WIN32 AND PURPLE_INCLUDE_DIR )
-	if (PURPLE_NOT_RUNTIME)
+	if (NOT PURPLE_NOT_RUNTIME)
 		set(PURPLE_LIBRARY "")
-	endif(PURPLE_NOT_RUNTIME)
+	endif(NOT PURPLE_NOT_RUNTIME)
 	set(PURPLE_FOUND 1)
 	message(STATUS "Using purple: ${PURPLE_INCLUDE_DIR} ${PURPLE_LIBRARY}")
 else()