diff --git a/scripts/fuzz_opt.py b/scripts/fuzz_opt.py
index 77fc664c94a..a4adb7b7910 100755
--- a/scripts/fuzz_opt.py
+++ b/scripts/fuzz_opt.py
@@ -294,6 +294,8 @@ def is_git_repo():
 
 
 INITIAL_CONTENTS_IGNORE = [
+    # Float16 is still experimental.
+    'f16.wast',
     # not all relaxed SIMD instructions are implemented in the interpreter
     'relaxed-simd.wast',
     # TODO: fuzzer and interpreter support for strings