diff --git a/include/criterion/internal/assert.h b/include/criterion/internal/assert.h
index 98cf0a5..de00f32 100644
--- a/include/criterion/internal/assert.h
+++ b/include/criterion/internal/assert.h
@@ -80,12 +80,6 @@ CR_END_C_API
 # define CR_GET_CONDITION_STR(Condition, ...) #Condition
 # define CR_VA_SKIP(_, ...) __VA_ARGS__
 
-# ifdef __cplusplus
-#  define CR_STDN std::
-# else
-#  define CR_STDN
-# endif
-
 # define CR_TRANSLATE_DEF_MSG__(Arg) \
     CR_IDENTITY Arg
 
diff --git a/include/criterion/internal/common.h b/include/criterion/internal/common.h
index 03d44db..fef1735 100644
--- a/include/criterion/internal/common.h
+++ b/include/criterion/internal/common.h
@@ -151,4 +151,10 @@
 #  endif
 # endif
 
+# ifdef __cplusplus
+#  define CR_STDN std::
+# else
+#  define CR_STDN
+# endif
+
 #endif /* !CRITERION_COMMON_H_ */