diff --git a/fuzzers/config_file_fuzzer.c b/fuzzers/config_file_fuzzer.c
index 869812029..fd604fa34 100644
--- a/fuzzers/config_file_fuzzer.c
+++ b/fuzzers/config_file_fuzzer.c
@@ -5,34 +5,50 @@
 #include <unistd.h>
 #include <limits.h>
 
+#define UNUSED(x) (void)(x)
+
 int foreach_cb(const git_config_entry *entry, void *payload)
 {
+	UNUSED(entry);
+	UNUSED(payload);
+
+	return 0;
+}
+
+static char path[] = "/tmp/git.XXXXXX";
+static int fd = -1;
+
+int LLVMFuzzerInitialize(int *argc, char ***argv)
+{
+	UNUSED(argc);
+	UNUSED(argv);
+
+	if (git_libgit2_init() < 0)
+		abort();
+	fd = mkstemp(path);
+	if (fd < 0) {
+		abort();
+	}
+
 	return 0;
 }
 
 int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size)
 {
-	static int fd = -1;
-	static char path[] = "/tmp/git.XXXXXX";
-	if (fd < 0) {
-		git_libgit2_init();
-		fd = mkstemp(path);
-		if (fd < 0) {
-			abort();
-		}
-	}
+	git_config *cfg = NULL;
+	int err = 0;
+
 	if (ftruncate(fd, 0) !=0 ) {
 		abort();
 	}
 	if (lseek(fd, 0, SEEK_SET) != 0) {
 		abort();
 	}
-	if (write(fd, data, size) != size) {
+	if ((size_t)write(fd, data, size) != size) {
 		abort();
 	}
 
-	git_config *cfg;
-	int err = git_config_open_ondisk(&cfg, path);
+	err = git_config_open_ondisk(&cfg, path);
 	if (err == 0) {
 		git_config_foreach(cfg, foreach_cb, NULL);
 		git_config_free(cfg);