diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 8c655bd75a96..ceb0d665f689 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,7 @@
+2018-06-14  Sebastian Huber  <sebastian.huber@embedded-brains.de>
+
+	* config/rtems.h (STDINT_LONG32): Define.
+
 2018-06-13  Matthew Fortune  <matthew.fortune@mips.com>
 	    Prachi Godbole  <prachi.godbole@imgtec.com>
 
diff --git a/gcc/config/rtems.h b/gcc/config/rtems.h
index dcea95cddade..af58eb161159 100644
--- a/gcc/config/rtems.h
+++ b/gcc/config/rtems.h
@@ -48,3 +48,7 @@
  -latomic -lc -lgcc --end-group %{!qnolinkcmds: -T linkcmds%s}}}"
 
 #define TARGET_POSIX_IO
+
+/* Prefer int for int32_t (see stdint-newlib.h).  */
+#undef STDINT_LONG32
+#define STDINT_LONG32 (INT_TYPE_SIZE != 32 && LONG_TYPE_SIZE == 32)