diff --git a/src/test/fuzz/integer.cpp b/src/test/fuzz/integer.cpp
--- a/src/test/fuzz/integer.cpp
+++ b/src/test/fuzz/integer.cpp
@@ -5,6 +5,7 @@
 #include <amount.h>
 #include <arith_uint256.h>
 #include <chainparams.h>
+#include <clientversion.h>
 #include <compressor.h>
 #include <config.h>
 #include <consensus/merkle.h>
@@ -96,6 +97,7 @@
     (void)DecompressAmount(u64);
     (void)FormatISO8601Date(i64);
     (void)FormatISO8601DateTime(i64);
+    (void)FormatVersion(i32);
     // FormatMoney(i) not defined when i == std::numeric_limits<int64_t>::min()
     if (i64 != std::numeric_limits<int64_t>::min()) {
         Amount parsed_money;
diff --git a/src/test/fuzz/string.cpp b/src/test/fuzz/string.cpp
--- a/src/test/fuzz/string.cpp
+++ b/src/test/fuzz/string.cpp
@@ -52,9 +52,8 @@
         random_string_1,
         fuzzed_data_provider.ConsumeIntegralInRange<size_t>(0, 1000),
         fuzzed_data_provider.ConsumeIntegralInRange<size_t>(0, 1000));
-    (void)FormatSubVersion(random_string_1,
-                           fuzzed_data_provider.ConsumeIntegral<int>(),
-                           random_string_vector);
+    (void)FormatUserAgent(random_string_1, random_string_2,
+                          random_string_vector);
     (void)GetDescriptorChecksum(random_string_1);
     (void)HelpExampleCli(random_string_1, random_string_2);
     (void)HelpExampleRpc(random_string_1, random_string_2);