diff --git a/gap-ace.spec b/gap-ace.spec
index 11b8b1d..a8e7753 100644
--- a/gap-ace.spec
+++ b/gap-ace.spec
@@ -26,6 +26,7 @@ URL:            https://gap-packages.github.io/ace/
 
 #Git-Clone:	https://github.com/gap-packages/ace
 Source:         https://github.com/gap-packages/ace/releases/download/v%version/ace-%version.tar.gz
+BuildRequires:  fdupes
 BuildRequires:  gap
 BuildRequires:  gap-devel
 BuildRequires:  gap-rpm-devel
@@ -44,8 +45,11 @@ from within GAP.
 %make_build CC="cc %optflags"
 
 %install
-rm -Rf Makefile* configure src/
 %gappkg_simple_install
+pushd "%buildroot/$fmoddir/"
+rm -Rf Makefile* configure src/
+popd
+%fdupes %buildroot/%_prefix
 
 %files -f %name.files