diff --git a/gcc/ada/ChangeLog b/gcc/ada/ChangeLog
index 3de821f12b1..56afab01ff5 100644
--- a/gcc/ada/ChangeLog
+++ b/gcc/ada/ChangeLog
@@ -1,3 +1,9 @@
+2018-03-07  Sebastian Huber  <sebastian.huber@embedded-brains.de>
+
+	* gcc-interface/Makefile.in (OSCONS_CPP): Remove redundant
+	$(GNATLIBCFLAGS).
+	(OSCONS_EXTRACT): Add $(GNATLIBCFLAGS_FOR_C).
+
 2018-03-06  Eric Botcazou  <ebotcazou@adacore.com>
 
 	* gcc-interface/trans.c (convert_with_check): Fix typo in the condition
diff --git a/gcc/ada/gcc-interface/Makefile.in b/gcc/ada/gcc-interface/Makefile.in
index 50213c7520e..ebb955ebce5 100644
--- a/gcc/ada/gcc-interface/Makefile.in
+++ b/gcc/ada/gcc-interface/Makefile.in
@@ -2381,9 +2381,9 @@ OSCONS_CC=$(subst ./xgcc,../../xgcc,$(subst -B./, -B../../,$(GCC_FOR_TARGET)))
 # ada/types.h does not conflict with a same-named system header (VxWorks
 # has a <types.h> header).
 
-OSCONS_CPP=$(OSCONS_CC) $(GNATLIBCFLAGS) $(GNATLIBCFLAGS_FOR_C) -E -C \
+OSCONS_CPP=$(OSCONS_CC) $(GNATLIBCFLAGS_FOR_C) -E -C \
   -DTARGET=\"$(target)\" -iquote $(fsrcpfx)ada $(fsrcpfx)ada/s-oscons-tmplt.c > s-oscons-tmplt.i
-OSCONS_EXTRACT=$(OSCONS_CC) -S s-oscons-tmplt.i
+OSCONS_EXTRACT=$(OSCONS_CC) $(GNATLIBCFLAGS_FOR_C) -S s-oscons-tmplt.i
 
 # Note: if you need to build with a non-GNU compiler, you could adapt the
 # following definitions (written for VMS DEC-C)