diff --git a/examples/Runlen.cpp b/examples/Runlen.cpp
index 235930a..fe86d0e 100644
--- a/examples/Runlen.cpp
+++ b/examples/Runlen.cpp
@@ -40,7 +40,7 @@ char* decode(const char* output) {
 #define MAX_STR_LEN 3
 
 TEST(Runlength, EncodeDecode) {
-  char* original = DeepState_CStrUpToLen(MAX_STR_LEN, "ab");
+  char* original = DeepState_CStrUpToLen(MAX_STR_LEN, "abcdefghijklmnopqrstuvwxyz0123456789");
   char* encoded = encode(original);
   char* roundtrip = decode(encoded);
   ASSERT (strncmp(roundtrip, original, MAX_STR_LEN) == 0) <<