--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -134,7 +134,7 @@ else (USE_EXT_GD)
 	endif (ENABLE_ICONV)
 
 	IF (ENABLE_WEBP)
-		FIND_PACKAGE(WEBP REQUIRED)
+		FIND_PACKAGE(WebP REQUIRED)
 	ENDIF (ENABLE_WEBP)
 
 	IF (ENABLE_HEIF)
@@ -195,10 +195,10 @@ else (USE_EXT_GD)
 		LIST(APPEND PKG_REQUIRES_PRIVATES zlib)
 	ENDIF(ZLIB_FOUND)
 
-	IF(WEBP_FOUND)
-		INCLUDE_DIRECTORIES(${WEBP_INCLUDE_DIR})
+	IF(WebP_FOUND)
+		INCLUDE_DIRECTORIES(${WebP_INCLUDE_DIR})
 		SET(HAVE_LIBWEBP 1)
-	ENDIF(WEBP_FOUND)
+	ENDIF(WebP_FOUND)
 
 	IF(HEIF_FOUND)
 		INCLUDE_DIRECTORIES(${HEIF_INCLUDE_DIR})