diff --git a/apps/shell/shell-crc.c b/apps/shell/shell-crc.c
index 315ca18e2..b3234577a 100644
--- a/apps/shell/shell-crc.c
+++ b/apps/shell/shell-crc.c
@@ -50,6 +50,7 @@
 #define HAVE_ALLOCA 0
 #else
 #define HAVE_ALLOCA 1
+#include <alloca.h>
 #endif
 
 #define DEBUG 0