diff --git a/benchmarks/string_benchmark.cpp b/benchmarks/string_benchmark.cpp
index 9635929..38122f2 100644
--- a/benchmarks/string_benchmark.cpp
+++ b/benchmarks/string_benchmark.cpp
@@ -187,6 +187,11 @@
   const size_t src_alignment = state.range(1);
   const size_t dst_alignment = state.range(2);
 
+  // Skip sizes that don't make sense.
+  if ((nbytes / 2) == 0) {
+    return;
+  }
+
   std::vector<char> src;
   std::vector<char> dst;
   char* src_aligned = GetAlignedPtrFilled(&src, src_alignment, nbytes / 2, 'x');