diff --git a/src/saveload/extended_ver_sl.cpp b/src/saveload/extended_ver_sl.cpp
index 922e3b7301..9800c6a2cc 100644
--- a/src/saveload/extended_ver_sl.cpp
+++ b/src/saveload/extended_ver_sl.cpp
@@ -194,23 +194,23 @@ void SlXvSetCurrentState()
 void SlXvCheckSpecialSavegameVersions()
 {
 	// Checks for special savegame versions go here
-	extern uint16 _sl_version;
+	extern SaveLoadVersion _sl_version;
 
 	if (_sl_version == 2000) {
 		DEBUG(sl, 1, "Loading a trace restrict patch savegame version %d as version 194", _sl_version);
-		_sl_version = 194;
+		_sl_version = (SaveLoadVersion) 194;
 		_sl_is_faked_ext = true;
 		_sl_xv_feature_versions[XSLFI_TRACE_RESTRICT] = 1;
 	}
 	if (_sl_version == 2001) {
 		DEBUG(sl, 1, "Loading a trace restrict patch savegame version %d as version 195", _sl_version);
-		_sl_version = 195;
+		_sl_version = (SaveLoadVersion) 195;
 		_sl_is_faked_ext = true;
 		_sl_xv_feature_versions[XSLFI_TRACE_RESTRICT] = 6;
 	}
 	if (_sl_version == 2002) {
 		DEBUG(sl, 1, "Loading a trace restrict patch savegame version %d as version 196", _sl_version);
-		_sl_version = 196;
+		_sl_version = (SaveLoadVersion) 196;
 		_sl_is_faked_ext = true;
 		_sl_xv_feature_versions[XSLFI_TRACE_RESTRICT] = 6;
 	}
@@ -218,49 +218,49 @@ void SlXvCheckSpecialSavegameVersions()
 	if (_sl_version == 220) { /* SL_SPRING_2013_v2_0_102 */
 		DEBUG(sl, 1, "Loading a SpringPP 2013 v2.0.102 savegame version %d as version 187", _sl_version);
 
-		_sl_version = 187;
+		_sl_version = (SaveLoadVersion) 187;
 		_sl_is_faked_ext = true;
 		_sl_xv_feature_versions[XSLFI_SPRINGPP] = 1;
 	} else if (_sl_version == 221) { /* SL_SPRING_2013_v2_1_108 */
 		DEBUG(sl, 1, "Loading a SpringPP 2013 v2.1.108 savegame version %d as version 188", _sl_version);
 
-		_sl_version = 188;
+		_sl_version = (SaveLoadVersion) 188;
 		_sl_is_faked_ext = true;
 		_sl_xv_feature_versions[XSLFI_SPRINGPP] = 2;
 	} else if (_sl_version == 222) { /* SL_SPRING_2013_v2_1_147 */
 		DEBUG(sl, 1, "Loading a SpringPP 2013 v2.1.147 savegame version %d as version 194", _sl_version);
 
-		_sl_version = 194;
+		_sl_version = (SaveLoadVersion) 194;
 		_sl_is_faked_ext = true;
 		_sl_xv_feature_versions[XSLFI_SPRINGPP] = 4; // Note that this break in numbering is deliberate
 	} else if (_sl_version == 223) { /* SL_SPRING_2013_v2_3_XXX */
 		DEBUG(sl, 1, "Loading a SpringPP 2013 v2.3.xxx savegame version %d as version 194", _sl_version);
 
-		_sl_version = 194;
+		_sl_version = (SaveLoadVersion) 194;
 		_sl_is_faked_ext = true;
 		_sl_xv_feature_versions[XSLFI_SPRINGPP] = 3; // Note that this break in numbering is deliberate
 	} else if (_sl_version == 224) { /* SL_SPRING_2013_v2_3_b3 */
 		DEBUG(sl, 1, "Loading a SpringPP 2013 v2.3.b3 savegame version %d as version 194", _sl_version);
 
-		_sl_version = 194;
+		_sl_version = (SaveLoadVersion) 194;
 		_sl_is_faked_ext = true;
 		_sl_xv_feature_versions[XSLFI_SPRINGPP] = 5;
 	} else if (_sl_version == 225) { /* SL_SPRING_2013_v2_3_b4 */
 		DEBUG(sl, 1, "Loading a SpringPP 2013 v2.3.b4 savegame version %d as version 194", _sl_version);
 
-		_sl_version = 194;
+		_sl_version = (SaveLoadVersion) 194;
 		_sl_is_faked_ext = true;
 		_sl_xv_feature_versions[XSLFI_SPRINGPP] = 6;
 	} else if (_sl_version == 226) { /* SL_SPRING_2013_v2_3_b5 */
 		DEBUG(sl, 1, "Loading a SpringPP 2013 v2.3.b5 savegame version %d as version 195", _sl_version);
 
-		_sl_version = 195;
+		_sl_version = (SaveLoadVersion) 195;
 		_sl_is_faked_ext = true;
 		_sl_xv_feature_versions[XSLFI_SPRINGPP] = 7;
 	} else if (_sl_version == 227) { /* SL_SPRING_2013_v2_4 */
 		DEBUG(sl, 1, "Loading a SpringPP 2013 v2.4 savegame version %d as version 195", _sl_version);
 
-		_sl_version = 195;
+		_sl_version = (SaveLoadVersion) 195;
 		_sl_is_faked_ext = true;
 		_sl_xv_feature_versions[XSLFI_SPRINGPP] = 8;
 	}