diff --git a/CMakeLists.txt b/CMakeLists.txt
index 18d8f271e..9bdc72f25 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -65,7 +65,7 @@ if (NOT WIN32)
     find_package(CURL)
 endif()
 if (NOT C3_LLVM_VERSION STREQUAL "auto")
-    if (${C3_LLVM_VERSION} VERSION_LESS 15 OR ${C3_LLVM_VERSION} VERSION_GREATER 17)
+    if (${C3_LLVM_VERSION} VERSION_LESS 15 OR ${C3_LLVM_VERSION} VERSION_GREATER 18)
         message(FATAL_ERROR "LLVM ${C3_LLVM_VERSION} is not supported!")
     endif()
 endif()