diff --git a/prusa-slicer.spec b/prusa-slicer.spec
index 6e789f4..856cf04 100644
--- a/prusa-slicer.spec
+++ b/prusa-slicer.spec
@@ -316,7 +316,7 @@ commit "Disable voronoi test"
 # -DSLIC3R_FHS=1 - Enable FHS layout instead of installing things into the resources directory
 # -DSLIC3R_WX_STABLE=1 - Allow use of wxGTK version 3.0 instead of 3.1.
 %cmake -DSLIC3R_PCH=0 -DSLIC3R_FHS=1 -DSLIC3R_WX_STABLE=1 -DSLIC3R_GTK=3 \
-    -DSLIC3R_BUILD_TESTS=1 -DCMAKE_BUILD_TYPE=Release \
+    -DSLIC3R_BUILD_TESTS=1 -DCMAKE_BUILD_TYPE=Release -DSLIC3R_ENABLE_FORMAT_STEP=0 \
 %if %{with perltests}
     -DSLIC3R_PERL_XS=1
 %endif