diff --git a/config/config.h.in b/config/config.h.in
index 89fb128417..28180301cb 100644
--- a/config/config.h.in
+++ b/config/config.h.in
@@ -60,7 +60,6 @@
 #define HAVE_SIGSTACK 1
 #define HAVE_SIGVEC 1
 #define HAVE_ST_BLKSIZE 1
-#define HAVE_STDLIB_H 1
 #define HAVE_STRCASECMP 1
 #define HAVE_STRERROR 1
 #define HAVE_STRFTIME 1
diff --git a/src/os_unix_defs.h b/src/os_unix_defs.h
index 94ff9ffb68..4545ddd77d 100644
--- a/src/os_unix_defs.h
+++ b/src/os_unix_defs.h
@@ -16,9 +16,7 @@
 # include <sys/types.h>
 # include <sys/stat.h>
 
-#ifdef HAVE_STDLIB_H
 # include <stdlib.h>
-#endif