diff --git a/gold/Makefile.am b/gold/Makefile.am
index b8a3be8c46..11476f80b9 100644
--- a/gold/Makefile.am
+++ b/gold/Makefile.am
@@ -15,7 +15,7 @@ INCLUDES = -D_GNU_SOURCE \
 	-DLOCALEDIR="\"$(datadir)/locale\"" \
 	@INCINTL@
 
-YFLAGS = -d
+AM_YFLAGS = -d
 
 noinst_PROGRAMS = ld-new
 noinst_LIBRARIES = libgold.a
diff --git a/gold/Makefile.in b/gold/Makefile.in
index 1a0f62cab7..f2ef3a8b25 100644
--- a/gold/Makefile.in
+++ b/gold/Makefile.in
@@ -262,7 +262,7 @@ INCLUDES = -D_GNU_SOURCE \
 	-DLOCALEDIR="\"$(datadir)/locale\"" \
 	@INCINTL@
 
-YFLAGS = -d
+AM_YFLAGS = -d
 noinst_LIBRARIES = libgold.a
 CCFILES = \
 	archive.cc \