diff --git a/src/bench/crypto_hash.cpp b/src/bench/crypto_hash.cpp
index 27dbbf62b..1b0d1fa75 100644
--- a/src/bench/crypto_hash.cpp
+++ b/src/bench/crypto_hash.cpp
@@ -92,7 +92,7 @@ static void HASH_SipHash_0032b(benchmark::State& state)
 static void FastRandom_32bit(benchmark::State& state)
 {
     FastRandomContext rng(true);
-    uint32_t x;
+    uint32_t x = 0;
     while (state.KeepRunning()) {
         for (int i = 0; i < 1000000; i++) {
             x += rng.rand32();
@@ -103,7 +103,7 @@ static void FastRandom_32bit(benchmark::State& state)
 static void FastRandom_1bit(benchmark::State& state)
 {
     FastRandomContext rng(true);
-    uint32_t x;
+    uint32_t x = 0;
     while (state.KeepRunning()) {
         for (int i = 0; i < 1000000; i++) {
             x += rng.randbool();