diff --git a/CMakeLists.txt b/CMakeLists.txt
index 38f18f17..771bddf1 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -140,7 +140,7 @@ if(CUTTER_ENABLE_PYTHON)
     endif()
 endif()
 
-if(CUTTER_ENABLE_KSYNTAXHIGHLIGHTING)
+if(CUTTER_ENABLE_KSYNTAXHIGHLIGHTING AND (NOT CUTTER_QT6))
     if(CUTTER_ENABLE_KSYNTAXHIGHLIGHTING STREQUAL AUTO)
         find_package(KF5SyntaxHighlighting)
         if(KF5SyntaxHighlighting_FOUND)
@@ -153,6 +153,9 @@ if(CUTTER_ENABLE_KSYNTAXHIGHLIGHTING)
         set(KSYNTAXHIGHLIGHTING_STATUS ON)
     endif()
 else()
+    if(CUTTER_ENABLE_KSYNTAXHIGHLIGHTING AND CUTTER_QT6)
+        message(WARNING "KSyntaxHighlighting has been disabled because not supported in QT6")
+    endif()
     set(KSYNTAXHIGHLIGHTING_STATUS OFF)
 endif()