diff --git a/editline/np/vis.c b/editline/np/vis.c
index 97406cdf8c..83265f46ea 100644
--- a/editline/np/vis.c
+++ b/editline/np/vis.c
@@ -68,6 +68,7 @@ __weak_alias(vis,_vis)
 #endif
 
 #ifdef SOLARIS
+#include <alloca.h>
 typedef unsigned int	u_int32_t;
 #endif
 
diff --git a/editline/readline.c b/editline/readline.c
index 2d398e12ab..442118b383 100644
--- a/editline/readline.c
+++ b/editline/readline.c
@@ -51,6 +51,11 @@ __RCSID("$NetBSD: readline.c,v 1.21 2002/03/18 16:20:36 christos Exp $");
 #include <stdlib.h>
 #include <unistd.h>
 #include <limits.h>
+
+#ifdef SOLARIS
+#include <alloca.h>
+#endif
+
 #include "histedit.h"
 #include "readline/readline.h"
 #include "el.h"