diff --git a/include/c11/threads.h b/include/c11/threads.h
index 790f52cb49f..81f4b9b7c09 100644
--- a/include/c11/threads.h
+++ b/include/c11/threads.h
@@ -35,8 +35,6 @@
 #define TIME_UTC 1
 #endif
 
-#include "c99_compat.h" /* for `inline` */
-
 /*---------------------------- types ----------------------------*/
 typedef void (*tss_dtor_t)(void*);
 typedef int (*thrd_start_t)(void*);
diff --git a/include/c99_math.h b/include/c99_math.h
index e906c26aa54..439a27fd61a 100644
--- a/include/c99_math.h
+++ b/include/c99_math.h
@@ -35,7 +35,6 @@
 #define _C99_MATH_H_
 
 #include <math.h>
-#include "c99_compat.h"
 
 
 /* This is to ensure that we get M_PI, etc. definitions */