diff --git a/src/libslic3r/Model.cpp b/src/libslic3r/Model.cpp
index fff9e3fca..f773d84f0 100644
--- a/src/libslic3r/Model.cpp
+++ b/src/libslic3r/Model.cpp
@@ -3809,7 +3809,7 @@ double Model::findMaxSpeed(const ModelObject* object) {
         if (objectKey == "outer_wall_speed")
             externalPerimeterSpeedObj = object->config.get().opt_float_nullable(objectKey, 0);
         if (objectKey == "small_perimeter_speed")
-            smallPerimeterSpeedObj = object->config.get().opt_float_nullable(objectKey,0);
+            smallPerimeterSpeedObj = object->config.get().option<ConfigOptionFloatsOrPercentsNullable>(objectKey)->get_at(0).get_abs_value(externalPerimeterSpeedObj);
     }
     objMaxSpeed = std::max(perimeterSpeedObj, std::max(externalPerimeterSpeedObj, std::max(infillSpeedObj, std::max(solidInfillSpeedObj, std::max(topSolidInfillSpeedObj, std::max(supportSpeedObj, std::max(smallPerimeterSpeedObj,objMaxSpeed)))))));
     if (objMaxSpeed <= 0) objMaxSpeed = 250.;