diff --git a/b4.spec b/b4.spec
index a0aee03..ec0d1e8 100644
--- a/b4.spec
+++ b/b4.spec
@@ -27,6 +27,7 @@ Source0:        https://github.com/mricon/b4/archive/refs/tags/v%{version}.tar.g
 BuildArch:      noarch
 BuildRequires:  fdupes
 # SECTION test requirements
+BuildRequires:  fdupes
 BuildRequires:  git-core
 BuildRequires:  python3-dkimpy >= 1.0.5
 BuildRequires:  python3-dnspython >= 2.0.0