diff --git a/bench/Makefile b/bench/Makefile
index a40efcdd..66893b94 100644
--- a/bench/Makefile
+++ b/bench/Makefile
@@ -406,6 +406,7 @@ bench-verstable:
 bench-verstable0:
 	$(CC) $(CFLAGS) $(XCFLAGS) $(CPPFLAGS) -I $${VERSTABLE}/ bench-verstable.c common.c -o bench-verstable.exe
 	@./bench-verstable.exe 40
+	@./bench-verstable.exe 41
 
 ############################################################################
 
diff --git a/bench/bench-verstable.c b/bench/bench-verstable.c
index 6d6f1077..80aeda47 100644
--- a/bench/bench-verstable.c
+++ b/bench/bench-verstable.c
@@ -4,6 +4,7 @@
 #include <stdio.h>
 #include <stdbool.h>
 
+#include "m-core.h"
 #include "common.h"
 
 #define NAME umap_ulong
@@ -36,8 +37,53 @@ test_dict(size_t  n)
 
 /********************************************************************************************/
 
+#ifndef CHAR_ARRAY_SIZE
+#define CHAR_ARRAY_SIZE 256
+#endif
+typedef char char_array_t[CHAR_ARRAY_SIZE];
+typedef struct  { char_array_t a; } char_encap;// Cannot use char_array_t directly
+static bool char_equal_p (const char_encap a, const char_encap b) { return strcmp(a.a,b.a)==0; }
+static size_t char_hash(const char_encap a) { return m_core_hash (a.a, strlen(a.a)); }
+
+#define NAME umap_char_array
+#define KEY_TY char_encap
+#define VAL_TY char_encap
+#define HASH_FN char_hash
+#define CMPR_FN char_equal_p
+#include "verstable.h"
+
+static void
+test_dict_big(size_t  n)
+{
+  umap_char_array dict;
+  umap_char_array_init(&dict);
+
+  for (size_t i = 0; i < n; i++) {
+    char_encap s1, s2;
+    
+    sprintf(s1.a, "%u", rand_get());
+    sprintf(s2.a, "%u", rand_get());
+    umap_char_array_insert(&dict, s1, s2);
+  }
+  rand_init();
+  unsigned int s = 0;
+  for (size_t i = 0; i < n; i++) {
+    char_encap s1;
+    sprintf(s1.a, "%u", rand_get());
+    umap_char_array_itr it = umap_char_array_get(&dict, s1);
+    if (!umap_char_array_is_end(it) )
+      s ++;
+  }
+  g_result = s;
+
+  umap_char_array_cleanup(&dict);
+}
+
+/********************************************************************************************/
+
 const config_func_t table[] = {
   { 40,    "dict",   1000000, 0, test_dict, 0},
+  { 41, "dictBig",   1000000, 0, test_dict_big, 0},
 };
 
 int main(int argc, const char *argv[])