diff --git a/src/core/qgsellipsoidutils.cpp b/src/core/qgsellipsoidutils.cpp
index 04cbe72b8e81..4720e00ae16e 100644
--- a/src/core/qgsellipsoidutils.cpp
+++ b/src/core/qgsellipsoidutils.cpp
@@ -405,11 +405,11 @@ QList<QgsEllipsoidUtils::EllipsoidDefinition> QgsEllipsoidUtils::definitions()
               def.parameters.semiMinor = semiMinor;
               def.parameters.inverseFlattening = invFlattening;
               if ( !semiMinorComputed )
-                def.parameters.crs = QgsCoordinateReferenceSystem::fromProj( QStringLiteral( "+proj=longlat +a=%1 +b=%2 +no_defs +type=crs" ).arg( def.parameters.semiMajor, 0, 'g', 17 ).arg( def.parameters.semiMinor, 0, 'g', 17 ) );
+                def.parameters.crs.createFromProj( QStringLiteral( "+proj=longlat +a=%1 +b=%2 +no_defs +type=crs" ).arg( def.parameters.semiMajor, 0, 'g', 17 ).arg( def.parameters.semiMinor, 0, 'g', 17 ), false );
               else if ( !qgsDoubleNear( def.parameters.inverseFlattening, 0.0 ) )
-                def.parameters.crs = QgsCoordinateReferenceSystem::fromProj( QStringLiteral( "+proj=longlat +a=%1 +rf=%2 +no_defs +type=crs" ).arg( def.parameters.semiMajor, 0, 'g', 17 ).arg( def.parameters.inverseFlattening, 0, 'g', 17 ) );
+                def.parameters.crs.createFromProj( QStringLiteral( "+proj=longlat +a=%1 +rf=%2 +no_defs +type=crs" ).arg( def.parameters.semiMajor, 0, 'g', 17 ).arg( def.parameters.inverseFlattening, 0, 'g', 17 ), false );
               else
-                def.parameters.crs = QgsCoordinateReferenceSystem::fromProj( QStringLiteral( "+proj=longlat +a=%1 +no_defs +type=crs" ).arg( def.parameters.semiMajor, 0, 'g', 17 ) );
+                def.parameters.crs.createFromProj( QStringLiteral( "+proj=longlat +a=%1 +no_defs +type=crs" ).arg( def.parameters.semiMajor, 0, 'g', 17 ), false );
             }
             else
             {