diff --git a/src/libslic3r/PrintConfig.cpp b/src/libslic3r/PrintConfig.cpp
index 94f1e90f9..197f467a3 100644
--- a/src/libslic3r/PrintConfig.cpp
+++ b/src/libslic3r/PrintConfig.cpp
@@ -3183,6 +3183,10 @@ void PrintConfigDef::handle_legacy(t_config_option_key &opt_key, std::string &va
 #endif /* HAS_PRESSURE_EQUALIZER */
     };
 
+    // In PrusaSlicer 2.3.0-alpha0 the "monotonous" infill was introduced, which was later renamed to "monotonic".
+    if (value == "monotonous" && (opt_key == "top_fill_pattern" || opt_key == "bottom_fill_pattern" || opt_key == "fill_pattern"))
+        value = "monotonic";
+
     if (ignore.find(opt_key) != ignore.end()) {
         opt_key = "";
         return;