diff --git a/pkg/afl++/afl.c b/pkg/afl++/afl.c
index 838829fd9..61eb12c4a 100644
--- a/pkg/afl++/afl.c
+++ b/pkg/afl++/afl.c
@@ -23,7 +23,7 @@
 // zig_fuzz_test() runs one fuzz iteration on the given input buffer.
 // The Zig object should export these.
 void zig_fuzz_init();
-void zig_fuzz_test(unsigned char*, ssize_t);
+void zig_fuzz_test(unsigned char*, size_t);
 
 // Linker-provided symbols marking the boundaries of the __sancov_guards
 // section. These must be declared extern so the linker provides the actual
@@ -132,7 +132,9 @@ int main(int argc, char** argv) {
             ? 0
             : *__afl_fuzz_len;
 
-    zig_fuzz_test(buf, len);
+    if (len >= 0) {
+      zig_fuzz_test(buf, len);
+    }
   }
 
   return 0;
diff --git a/test/fuzz-libghostty/src/lib.zig b/test/fuzz-libghostty/src/lib.zig
index f33560317..b00f180aa 100644
--- a/test/fuzz-libghostty/src/lib.zig
+++ b/test/fuzz-libghostty/src/lib.zig
@@ -1,18 +1,15 @@
 const std = @import("std");
 const ghostty_vt = @import("ghostty-vt");
 
-pub export fn zig_fuzz_init() callconv(.c) void {}
-
-pub export fn zig_fuzz_test(buf: [*]const u8, len: isize) callconv(.c) void {
-    if (len <= 0) return;
-    ghostty_fuzz_parser(buf, @intCast(len));
+pub export fn zig_fuzz_init() callconv(.c) void {
+    // Nothing to do
 }
 
-pub export fn ghostty_fuzz_parser(
-    input_ptr: [*]const u8,
-    input_len: usize,
+pub export fn zig_fuzz_test(
+    buf: [*]const u8,
+    len: usize,
 ) callconv(.c) void {
     var p: ghostty_vt.Parser = .init();
     defer p.deinit();
-    for (input_ptr[0..input_len]) |byte| _ = p.next(byte);
+    for (buf[0..@intCast(len)]) |byte| _ = p.next(byte);
 }
diff --git a/test/fuzz-libghostty/src/main.c b/test/fuzz-libghostty/src/main.c
deleted file mode 100644
index e2f6942bb..000000000
--- a/test/fuzz-libghostty/src/main.c
+++ /dev/null
@@ -1,27 +0,0 @@
-#include <stdint.h>
-#include <stdio.h>
-#include <stdlib.h>
-
-void ghostty_fuzz_parser(const uint8_t *input, size_t input_len);
-
-int main(int argc, char **argv) {
-    uint8_t buf[4096];
-    size_t len = 0;
-    FILE *f = stdin;
-
-    if (argc > 1) {
-        f = fopen(argv[1], "rb");
-        if (f == NULL) {
-            return 0;
-        }
-    }
-
-    len = fread(buf, 1, sizeof(buf), f);
-
-    if (argc > 1) {
-        fclose(f);
-    }
-
-    ghostty_fuzz_parser(buf, len);
-    return 0;
-}