diff --git a/gcc/m2/gm2-gcc/m2linemap.cc b/gcc/m2/gm2-gcc/m2linemap.cc
index c916ba6155a..fcf589e840f 100644
--- a/gcc/m2/gm2-gcc/m2linemap.cc
+++ b/gcc/m2/gm2-gcc/m2linemap.cc
@@ -19,6 +19,7 @@ You should have received a copy of the GNU General Public License
 along with GNU Modula-2; see the file COPYING3.  If not see
 <http://www.gnu.org/licenses/>.  */
 
+#define INCLUDE_STRING
 #include "gcc-consolidation.h"
 
 /* Utilize some of the C build routines */
@@ -36,7 +37,6 @@ along with GNU Modula-2; see the file COPYING3.  If not see
 #define m2linemap_c
 #include "m2linemap.h"
 #include "m2color.h"
-#include <string>
 
 static int inFile = FALSE;
 
diff --git a/gcc/m2/gm2spec.cc b/gcc/m2/gm2spec.cc
index a4faf88027a..2a4dccf8b93 100644
--- a/gcc/m2/gm2spec.cc
+++ b/gcc/m2/gm2spec.cc
@@ -20,6 +20,8 @@ along with GNU Modula-2; see the file COPYING3.  If not see
 <http://www.gnu.org/licenses/>.  */
 
 #include "config.h"
+#define INCLUDE_STRING
+#define INCLUDE_VECTOR
 #include "system.h"
 #include "coretypes.h"
 #include "tm.h"
@@ -31,8 +33,6 @@ along with GNU Modula-2; see the file COPYING3.  If not see
 #include "gcc.h"
 #include "opts.h"
 #include "vec.h"
-#include <vector>
-#include <string>
 
 #include "m2/gm2config.h"