diff --git a/lang/m2/libm2/confarray.c b/lang/m2/libm2/confarray.c
index 8567d7fc9..d282a270c 100644
--- a/lang/m2/libm2/confarray.c
+++ b/lang/m2/libm2/confarray.c
@@ -10,6 +10,11 @@
 */
 #include <m2_traps.h>
 
+#ifndef EM_WSIZE
+#define EM_WSIZE _EM_WSIZE
+#define EM_PSIZE _EM_PSIZE
+#endif
+
 #if EM_WSIZE==EM_PSIZE
 typedef unsigned pcnt;
 #else
diff --git a/lang/m2/libm2/load.c b/lang/m2/libm2/load.c
index 9962377a6..3ec6321b2 100644
--- a/lang/m2/libm2/load.c
+++ b/lang/m2/libm2/load.c
@@ -11,6 +11,11 @@
 
 #include <m2_traps.h>
 
+#ifndef EM_WSIZE
+#define EM_WSIZE _EM_WSIZE
+#define EM_PSIZE _EM_PSIZE
+#endif
+
 #if EM_WSIZE==EM_PSIZE
 typedef unsigned pcnt;
 #else
diff --git a/lang/m2/libm2/store.c b/lang/m2/libm2/store.c
index 9de3d6328..d69aa4023 100644
--- a/lang/m2/libm2/store.c
+++ b/lang/m2/libm2/store.c
@@ -11,6 +11,11 @@
 
 #include <m2_traps.h>
 
+#ifndef EM_WSIZE
+#define EM_WSIZE _EM_WSIZE
+#define EM_PSIZE _EM_PSIZE
+#endif
+
 #if EM_WSIZE==EM_PSIZE
 typedef unsigned pcnt;
 #else