diff --git a/CMakeLists.txt b/CMakeLists.txt
index 9913606db5ac..edcbc32c986a 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -822,7 +822,7 @@ else()
   set(ZIG_NO_LANGREF_ARG "")
 endif()
 if(ZIG_SINGLE_THREADED)
-  set(ZIG_SINGLE_THREADED_ARG "-fsingle-threaded")
+  set(ZIG_SINGLE_THREADED_ARG "-Dsingle-threaded")
 else()
   set(ZIG_SINGLE_THREADED_ARG "")
 endif()