diff --git a/sys/amd64/include/vmparam.h b/sys/amd64/include/vmparam.h
index 1172db8db0f..2285680bc24 100644
--- a/sys/amd64/include/vmparam.h
+++ b/sys/amd64/include/vmparam.h
@@ -93,7 +93,7 @@
 /*
  * Size of the Shared Memory Pages page table.
  */
-#ifndef	SHMAXPGS
+#ifndef	SHMMAXPGS
 #define	SHMMAXPGS	64		/* XXX until we have more kmap space */
 #endif
 
diff --git a/sys/i386/include/vmparam.h b/sys/i386/include/vmparam.h
index 1172db8db0f..2285680bc24 100644
--- a/sys/i386/include/vmparam.h
+++ b/sys/i386/include/vmparam.h
@@ -93,7 +93,7 @@
 /*
  * Size of the Shared Memory Pages page table.
  */
-#ifndef	SHMAXPGS
+#ifndef	SHMMAXPGS
 #define	SHMMAXPGS	64		/* XXX until we have more kmap space */
 #endif