diff --git a/hfuzz/Cargo.toml b/hfuzz/Cargo.toml
index 8226f93..473364f 100644
--- a/hfuzz/Cargo.toml
+++ b/hfuzz/Cargo.toml
@@ -4,7 +4,7 @@ version = "0.1.0"
 authors = ["Sergey Pepyakin <s.pepyakin@gmail.com>"]
 
 [dependencies]
-honggfuzz = "0.5"
+honggfuzz = "=0.5.9" # Strict equal since hfuzz requires dep and cmd versions to match.
 wasmi = { path = ".." }
 tempdir = "0.3.6"
 wabt = "0.2.0"