diff --git a/pkgs/build-support/release/rpm-build.nix b/pkgs/build-support/release/rpm-build.nix
index 66a9c42ec04..a3256769762 100644
--- a/pkgs/build-support/release/rpm-build.nix
+++ b/pkgs/build-support/release/rpm-build.nix
@@ -32,14 +32,19 @@ vmTools.buildRPM (
           
           echo "installing $i..."
           rpm -ip "$i" --excludepath /nix/store
+        fi
+      done
 
+      eval "$postRPMInstall"
+      
+      for i in $out/rpms/*/*.rpm; do
+        if echo $i | grep -vq "\.src\.rpm$"; then
           rpmName="$(rpm -qp "$i")"
-          
           echo "uninstalling $rpmName..."
           rpm -e "$rpmName"
         fi
       done
-      
+
       for i in $out/rpms/*/*.src.rpm; do
         echo "file srpm $i" >> $out/nix-support/hydra-build-products
       done