diff --git a/exec.c b/exec.c
index 00f32f1..959f90b 100644
--- a/exec.c
+++ b/exec.c
@@ -1050,6 +1050,8 @@ int main(int argc, char **argv) {
                 p.vtype = TYPE_STRING;
             else if (argv[1][1] == 'v')
                 p.vtype = TYPE_VECTOR;
+            else
+                p.vtype = TYPE_VOID;
 
             --argc;
             ++argv;