diff --git a/runtime/Cpp/cmake/ExternalAntlr4Cpp.cmake b/runtime/Cpp/cmake/ExternalAntlr4Cpp.cmake
index 4d037cf50..18adff3bb 100644
--- a/runtime/Cpp/cmake/ExternalAntlr4Cpp.cmake
+++ b/runtime/Cpp/cmake/ExternalAntlr4Cpp.cmake
@@ -112,7 +112,7 @@ else()
       EXCLUDE_FROM_ALL 1)
 endif()
 
-# Seperate build step as rarely people want both
+# Separate build step as rarely people want both
 set(ANTLR4_BUILD_DIR ${ANTLR4_ROOT})
 if(${CMAKE_VERSION} VERSION_GREATER_EQUAL "3.14.0")
   # CMake 3.14 builds in above's SOURCE_SUBDIR when BUILD_IN_SOURCE is true