diff --git a/src/map/geotiff.cpp b/src/map/geotiff.cpp
index cd00d952..f33de18f 100644
--- a/src/map/geotiff.cpp
+++ b/src/map/geotiff.cpp
@@ -331,7 +331,7 @@ Projection::Method GeoTIFF::method(QMap<quint16, Value> &kv)
 		case CT_ObliqueMercator:
 			return Projection::Method(9815);
 		case CT_Mercator:
-			return Projection::Method(9805);
+			return Projection::Method(9804);
 		case CT_LambertConfConic_2SP:
 			return Projection::Method(9802);
 		case CT_LambertConfConic_1SP:
diff --git a/src/map/projection.cpp b/src/map/projection.cpp
index 06292ee9..a40487d4 100644
--- a/src/map/projection.cpp
+++ b/src/map/projection.cpp
@@ -17,7 +17,7 @@ Projection::Method::Method(int id)
 		case 1024:
 		case 9801:
 		case 9802:
-		case 9805:
+		case 9804:
 		case 9807:
 		case 9815:
 		case 9820:
@@ -51,7 +51,7 @@ Projection::Projection(const PCS *pcs) : _gcs(pcs->gcs()), _units(pcs->units()),
 			  setup.longitudeOrigin(), setup.falseEasting(),
 			  setup.falseNorthing());
 			break;
-		case 9805:
+		case 9804:
 			_ct = new Mercator(ellipsoid, setup.latitudeOrigin(),
 			  setup.longitudeOrigin(), setup.falseEasting(),
 			  setup.falseNorthing());