diff --git a/src/libslic3r/PrintConfig.cpp b/src/libslic3r/PrintConfig.cpp
index fd861cd114..d11a35d547 100644
--- a/src/libslic3r/PrintConfig.cpp
+++ b/src/libslic3r/PrintConfig.cpp
@@ -1105,7 +1105,7 @@ void PrintConfigDef::init_fff_params()
                      "at minimum speed to reduce the frequency of starting and stoping");
     def->set_default_value(new ConfigOptionBools { false });
 
-    def = this->add("fan_cooling_layer_time", coInts);
+    def = this->add("fan_cooling_layer_time", coFloats);
     def->label = L("Layer time");
     def->tooltip = L("Part cooling fan will be enabled for layers of which estimated time is shorter than this value. "
                      "Fan speed is interpolated between the minimum and maximum fan speeds according to layer printing time");
@@ -1113,7 +1113,7 @@ void PrintConfigDef::init_fff_params()
     def->min = 0;
     def->max = 1000;
     def->mode = comSimple;
-    def->set_default_value(new ConfigOptionInts { 60 });
+    def->set_default_value(new ConfigOptionFloats{ 60.0f });
 
     def = this->add("filament_colour", coStrings);
     def->label = L("Color");
@@ -2279,7 +2279,7 @@ void PrintConfigDef::init_fff_params()
     def->mode = comSimple;
     def->set_default_value(new ConfigOptionInt(1));
 
-    def = this->add("slow_down_layer_time", coInts);
+    def = this->add("slow_down_layer_time", coFloats);
     def->label = L("Layer time");
     def->tooltip = L("The printing speed in exported gcode will be slowed down, when the estimated layer time is shorter than this value, to "
                      "get better cooling for these layers");
@@ -2287,7 +2287,7 @@ void PrintConfigDef::init_fff_params()
     def->min = 0;
     def->max = 1000;
     def->mode = comSimple;
-    def->set_default_value(new ConfigOptionInts { 5 });
+    def->set_default_value(new ConfigOptionFloats { 5.0f });
 
     def = this->add("minimum_sparse_infill_area", coFloat);
     def->label = L("Minimum sparse infill threshold");
diff --git a/src/libslic3r/PrintConfig.hpp b/src/libslic3r/PrintConfig.hpp
index 590cda6e56..f58f5cbd00 100644
--- a/src/libslic3r/PrintConfig.hpp
+++ b/src/libslic3r/PrintConfig.hpp
@@ -844,7 +844,7 @@ PRINT_CONFIG_CLASS_DERIVED_DEFINE(
     ((ConfigOptionStrings,            extruder_colour))
     ((ConfigOptionPoints,             extruder_offset))
     ((ConfigOptionBools,              reduce_fan_stop_start_freq))
-    ((ConfigOptionInts,               fan_cooling_layer_time))
+    ((ConfigOptionFloats,             fan_cooling_layer_time))
     ((ConfigOptionStrings,            filament_colour))
     ((ConfigOptionFloat,              outer_wall_acceleration))
     ((ConfigOptionFloat,              inner_wall_acceleration))
@@ -883,7 +883,7 @@ PRINT_CONFIG_CLASS_DERIVED_DEFINE(
     ((ConfigOptionFloat,              skirt_distance))
     ((ConfigOptionInt,                skirt_height))
     ((ConfigOptionInt,                skirt_loops))
-    ((ConfigOptionInts,               slow_down_layer_time))
+    ((ConfigOptionFloats,             slow_down_layer_time))
     ((ConfigOptionBool,               spiral_mode))
     ((ConfigOptionInt,                standby_temperature_delta))
     ((ConfigOptionInts,               nozzle_temperature))