diff --git a/Modules/FindCURL.cmake b/Modules/FindCURL.cmake
index 3acadc2..74b36c6 100644
--- a/Modules/FindCURL.cmake
+++ b/Modules/FindCURL.cmake
@@ -150,16 +150,16 @@
   endif()
   foreach(component IN LISTS CURL_FIND_COMPONENTS)
     list(FIND CURL_KNOWN_PROTOCOLS ${component} _found)
-    if(_found)
+    if(NOT _found EQUAL -1)
       list(FIND CURL_SUPPORTED_PROTOCOLS ${component} _found)
-      if(_found)
+      if(NOT _found EQUAL -1)
         set(CURL_${component}_FOUND TRUE)
       elseif(CURL_FIND_REQUIRED)
         message(FATAL_ERROR "CURL: Required protocol ${component} is not found")
       endif()
     else()
       list(FIND CURL_SUPPORTED_FEATURES ${component} _found)
-      if(_found)
+      if(NOT _found EQUAL -1)
         set(CURL_${component}_FOUND TRUE)
       elseif(CURL_FIND_REQUIRED)
         message(FATAL_ERROR "CURL: Required feature ${component} is not found")