diff --git a/src/Mod/Part/App/ImportStep.cpp b/src/Mod/Part/App/ImportStep.cpp
index c0a6bb97ef..fc8e5fcbd3 100644
--- a/src/Mod/Part/App/ImportStep.cpp
+++ b/src/Mod/Part/App/ImportStep.cpp
@@ -195,10 +195,10 @@ void ImportExportSettings::setUnit(ImportExportSettings::Unit unit)
     hStepGrp->SetInt("Unit", static_cast<long>(unit));
 
     switch (unit) {
-        case Unit::M:
+        case Unit::Meter:
             Interface_Static::SetCVal("write.step.unit","M");
             break;
-        case Unit::IN:
+        case Unit::Inch:
             Interface_Static::SetCVal("write.step.unit","INCH");
             break;
         default:
diff --git a/src/Mod/Part/App/ImportStep.h b/src/Mod/Part/App/ImportStep.h
index 8560327945..906d09f65f 100644
--- a/src/Mod/Part/App/ImportStep.h
+++ b/src/Mod/Part/App/ImportStep.h
@@ -45,9 +45,9 @@ public:
         ObjectPerDirectory = 4,
     };
     enum class Unit {
-        MM = 0,
-        M = 1,
-        IN = 2,
+        Millimeter = 0,
+        Meter = 1,
+        Inch = 2,
     };
 
     static void initialize();