diff --git a/src/bench/prevector.cpp b/src/bench/prevector.cpp
--- a/src/bench/prevector.cpp
+++ b/src/bench/prevector.cpp
@@ -14,7 +14,7 @@
 static_assert(!IS_TRIVIALLY_CONSTRUCTIBLE<nontrivial_t>::value,
               "expected nontrivial_t to not be trivially constructible");
 
-typedef unsigned char trivial_t;
+typedef uint8_t trivial_t;
 static_assert(IS_TRIVIALLY_CONSTRUCTIBLE<trivial_t>::value,
               "expected trivial_t to be trivially constructible");
 
diff --git a/src/prevector.h b/src/prevector.h
--- a/src/prevector.h
+++ b/src/prevector.h
@@ -301,7 +301,7 @@
 
     void fill(T *dst, ptrdiff_t count) {
         if (IS_TRIVIALLY_CONSTRUCTIBLE<T>::value) {
-            // The most common use of prevector is where T=unsigned char. For
+            // The most common use of prevector is where T=uint8_t. For
             // trivially constructible types, we can use memset() to avoid
             // looping.
             ::memset(dst, 0, count * sizeof(T));