diff --git a/CMakeLists.txt b/CMakeLists.txt
index 2d43f6f8..e4a48b0d 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -244,7 +244,7 @@ if (HAVE_STRTOD_L)
 endif ()
 
 if (MINGW)
-  check_cxx_compiler_flag("Wa,-mbig-obj" FMT_HAS_MBIG_OBJ)
+  check_cxx_compiler_flag("-Wa,-mbig-obj" FMT_HAS_MBIG_OBJ)
   if (${FMT_HAS_MBIG_OBJ})
     target_compile_options(fmt PUBLIC "-Wa,-mbig-obj")
   endif()