diff --git a/src/components/modals/SourcesModal.jsx b/src/components/modals/SourcesModal.jsx
index 46b21e0..a4a54fb 100644
--- a/src/components/modals/SourcesModal.jsx
+++ b/src/components/modals/SourcesModal.jsx
@@ -144,8 +144,8 @@ class AddSource extends React.Component {
       case 'tilexyz_vector': return {
         type: 'vector',
         tiles: source.tiles || ['http://localhost:3000/{x}/{y}/{z}.pbf'],
-        minZoom: source.minZoom || 0,
-        maxZoom: source.maxZoom || 14
+        minZoom: source.minzoom || 0,
+        maxZoom: source.maxzoom || 14
       }
       case 'tilejson_raster': return {
         type: 'raster',
@@ -154,8 +154,8 @@ class AddSource extends React.Component {
       case 'tilexyz_raster': return {
         type: 'raster',
         tiles: source.tiles || ['http://localhost:3000/{x}/{y}/{z}.pbf'],
-        minZoom: source.minZoom || 0,
-        maxZoom: source.maxZoom || 14
+        minzoom: source.minzoom || 0,
+        maxzoom: source.maxzoom || 14
       }
       default: return {}
     }
diff --git a/src/components/sources/SourceTypeEditor.jsx b/src/components/sources/SourceTypeEditor.jsx
index 289b3ec..7ca2eff 100644
--- a/src/components/sources/SourceTypeEditor.jsx
+++ b/src/components/sources/SourceTypeEditor.jsx
@@ -46,19 +46,19 @@ class TileURLSourceEditor extends React.Component {
       {this.renderTileUrls()}
       <InputBlock label={"Min Zoom"} doc={GlSpec.source_tile.minzoom.doc}>
         <NumberInput
-          value={this.props.source.minZoom}
-          onChange={minZoom => this.props.onChange({
+          value={this.props.source.minzoom || 0}
+          onChange={minzoom => this.props.onChange({
             ...this.props.source,
-            minZoom: minZoom
+            minzoom: minzoom
           })}
         />
       </InputBlock>
       <InputBlock label={"Max Zoom"} doc={GlSpec.source_tile.maxzoom.doc}>
         <NumberInput
-          value={this.props.source.maxZoom}
-          onChange={maxZoom => this.props.onChange({
+          value={this.props.source.maxzoom || 22}
+          onChange={maxzoom => this.props.onChange({
             ...this.props.source,
-            maxZoom: maxZoom
+            maxzoom: maxzoom
           })}
         />
       </InputBlock>