diff --git a/sys/amd64/include/vmparam.h b/sys/amd64/include/vmparam.h
index 935142b84b72..f9dc90d3e958 100644
--- a/sys/amd64/include/vmparam.h
+++ b/sys/amd64/include/vmparam.h
@@ -72,7 +72,7 @@
 #define	DFLSSIZ		(512*1024)		/* initial stack size limit */
 #endif
 #ifndef	MAXSSIZ
-#define	MAXSSIZ		(2*1024*1024)		/* max stack size */
+#define	MAXSSIZ		(8*1024*1024)		/* max stack size */
 #endif
 
 /*
diff --git a/sys/i386/include/vmparam.h b/sys/i386/include/vmparam.h
index 935142b84b72..f9dc90d3e958 100644
--- a/sys/i386/include/vmparam.h
+++ b/sys/i386/include/vmparam.h
@@ -72,7 +72,7 @@
 #define	DFLSSIZ		(512*1024)		/* initial stack size limit */
 #endif
 #ifndef	MAXSSIZ
-#define	MAXSSIZ		(2*1024*1024)		/* max stack size */
+#define	MAXSSIZ		(8*1024*1024)		/* max stack size */
 #endif
 
 /*