diff --git a/crypto/fipsmodule/self_check/fips.c b/crypto/fipsmodule/self_check/fips.c
index 09fffddc0..d55c493cb 100644
--- a/crypto/fipsmodule/self_check/fips.c
+++ b/crypto/fipsmodule/self_check/fips.c
@@ -52,10 +52,13 @@ void boringssl_fips_inc_counter(enum fips_counter_t counter) {
   size_t *array =
       CRYPTO_get_thread_local(OPENSSL_THREAD_LOCAL_FIPS_COUNTERS);
   if (!array) {
-    array = OPENSSL_malloc(sizeof(size_t) * (fips_counter_max + 1));
+    const size_t num_bytes = sizeof(size_t) * (fips_counter_max + 1);
+    array = OPENSSL_malloc(num_bytes);
     if (!array) {
       return;
     }
+
+    OPENSSL_memset(array, 0, num_bytes);
     if (!CRYPTO_set_thread_local(OPENSSL_THREAD_LOCAL_FIPS_COUNTERS, array,
                                  OPENSSL_free)) {
       // |OPENSSL_free| has already been called by |CRYPTO_set_thread_local|.