diff --git a/gdbsupport/ChangeLog b/gdbsupport/ChangeLog
index e7a902760f..3583e5bd34 100644
--- a/gdbsupport/ChangeLog
+++ b/gdbsupport/ChangeLog
@@ -1,3 +1,8 @@
+2020-01-17   Pedro Alves  <palves@redhat.com>
+
+	* Makefile.am: Append CXX_DIALECT to CXX.
+	* Makefile.in: Regenerate.
+
 2020-01-17  Pedro Alves  <palves@redhat.com>
 
 	* configure.ac: Generate config.h instead of support-config.h.
diff --git a/gdbsupport/Makefile.am b/gdbsupport/Makefile.am
index 1a001a0081..4b8a604ce5 100644
--- a/gdbsupport/Makefile.am
+++ b/gdbsupport/Makefile.am
@@ -24,6 +24,8 @@ AM_CPPFLAGS = -I$(srcdir)/../include -I$(srcdir)/../gdb \
     -I../gnulib/import -I$(srcdir)/../gnulib/import \
     -I.. -I$(srcdir)/.. $(INCINTL) -I../bfd -I$(srcdir)/../bfd
 
+override CXX += $(CXX_DIALECT)
+
 override CC := $(CXX)
 override CFLAGS := $(CXXFLAGS)
 
diff --git a/gdbsupport/Makefile.in b/gdbsupport/Makefile.in
index 5bbab1c310..31065af244 100644
--- a/gdbsupport/Makefile.in
+++ b/gdbsupport/Makefile.in
@@ -688,6 +688,8 @@ uninstall-am:
 .PRECIOUS: Makefile
 
 
+override CXX += $(CXX_DIALECT)
+
 override CC := $(CXX)
 override CFLAGS := $(CXXFLAGS)