diff --git a/src/libslic3r/Print.cpp b/src/libslic3r/Print.cpp
index 1664acdded..9df122cee5 100644
--- a/src/libslic3r/Print.cpp
+++ b/src/libslic3r/Print.cpp
@@ -1251,7 +1251,9 @@ std::string Print::validate() const
 		auto validate_extrusion_width = [min_nozzle_diameter, max_nozzle_diameter](const ConfigBase &config, const char *opt_key, double layer_height, std::string &err_msg) -> bool {
         	double extrusion_width_min = config.get_abs_value(opt_key, min_nozzle_diameter);
         	double extrusion_width_max = config.get_abs_value(opt_key, max_nozzle_diameter);
-        	if (extrusion_width_min <= layer_height) {
+        	if (extrusion_width_min == 0) {
+        		// Default "auto-generated" extrusion width is always valid.
+        	} else if (extrusion_width_min <= layer_height) {
         		err_msg = (boost::format(L("%1%=%2% mm is too low to be printable at a layer height %3% mm")) % opt_key % extrusion_width_min % layer_height).str();
 				return false;
 			} else if (extrusion_width_max >= max_nozzle_diameter * 2.) {