Fix format string in hamming benchmark.

1 files changed, 2 insertions, 1 deletions

diff --git a/vespalib/src/tests/util/hamming/hamming_benchmark.cpp b/vespalib/src/tests/util/hamming/hamming_benchmark.cpp
index b6393dcd1b7..347c935f5b7 100644
--- a/vespalib/src/tests/util/hamming/hamming_benchmark.cpp
+++ b/vespalib/src/tests/util/hamming/hamming_benchmark.cpp
@@ -2,6 +2,7 @@
 
 #include <vespa/vespalib/util/binary_hamming_distance.h>
 #include <vector>
+#include <cinttypes>
 #include <cstdlib>
 #include <cstdint>
 #include <cstdio>
@@ -35,6 +36,6 @@ int main(int argc, char* argv[]) {
         }
     }
 
-    printf("%lu vectors of %lu bits, repeated %lu times. Sum of distances = %lu\n", num_vectors, vector_length*8, num_reps, sum);
+    printf("%lu vectors of %lu bits, repeated %lu times. Sum of distances = %" PRIu64 "\n", num_vectors, vector_length*8, num_reps, sum);
     return 0;
 }