diff --git a/docker.spec b/docker.spec
index 0d62826..2882968 100644
--- a/docker.spec
+++ b/docker.spec
@@ -59,6 +59,7 @@ BuildRequires:  go-go-md2man
 %else
 BuildRequires:  gcc5-go >= 5.0
 %endif
+BuildRequires:  fdupes
 BuildRequires:  libapparmor-devel
 BuildRequires:  libbtrfs-devel >= 3.8
 BuildRequires:  procps
@@ -212,6 +213,8 @@ install -d %{buildroot}%{_mandir}/man5
 install -p -m 644 man/man5/Dockerfile.5 %{buildroot}%{_mandir}/man5
 %endif
 
+%fdupes %{buildroot}
+
 %pre
 echo "creating group docker..."
 groupadd -r docker 2>/dev/null || :