diff --git a/d3pie/d3pie.d.ts b/d3pie/d3pie.d.ts
index 58b2b25d3d..2bfe5d6525 100644
--- a/d3pie/d3pie.d.ts
+++ b/d3pie/d3pie.d.ts
@@ -3,142 +3,144 @@
 // Definitions by: Petryshyn Sergii <https://github.com/mc-petry>
 // Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
 
-interface ID3PieChart {
-  redraw(): void
-  openSegment(index: number): void
-  closeSegment(index: void): void
-  getOpenSegment(): any
-  updateProp(propKey: string, value: any): void
-  destroy(): void
-}
-
-interface ID3PieStyleOptions {
-  color?: string
-  fontSize?: number
-  font?: string
-}
-
-interface ID3PieTextOptions extends ID3PieStyleOptions {
-  text?: string
-}
-
-interface ID3PieLabelsOptions {
-  format?: 'label' | 'value' | 'percentage' | 'label-value1' | 'label-value2' | 'label-percentage1' | 'label-percentage2'
-  hideWhenLessThanPercentage?: number
-}
-
-interface ID3PieOptions {
-  header?: {
-    title?: ID3PieTextOptions
-    subtitle?: ID3PieTextOptions
-    location?: 'top-center' | 'top-left' | 'pie-center'
-    titleSubtitlePadding?: number
+declare namespace d3pie {
+  interface ID3PieChart {
+    redraw(): void
+    openSegment(index: number): void
+    closeSegment(index: void): void
+    getOpenSegment(): any
+    updateProp(propKey: string, value: any): void
+    destroy(): void
   }
-  footer?: { location?: 'left' } & ID3PieTextOptions
-  size?: {
-    canvasHeight?: number
-    canvasWidth?: number
-    pieOuterRadius?: string | number
-    pieInnerRadius?: string | number
+
+  interface ID3PieStyleOptions {
+    color?: string
+    fontSize?: number
+    font?: string
   }
-  data: {
-    sortOrder?: 'none' | 'random' | 'value-asc' | 'value-desc' | 'label-asc' | 'label-desc'
-    smallSegmentGrouping?: {
+
+  interface ID3PieTextOptions extends ID3PieStyleOptions {
+    text?: string
+  }
+
+  interface ID3PieLabelsOptions {
+    format?: 'label' | 'value' | 'percentage' | 'label-value1' | 'label-value2' | 'label-percentage1' | 'label-percentage2'
+    hideWhenLessThanPercentage?: number
+  }
+
+  interface ID3PieOptions {
+    header?: {
+      title?: ID3PieTextOptions
+      subtitle?: ID3PieTextOptions
+      location?: 'top-center' | 'top-left' | 'pie-center'
+      titleSubtitlePadding?: number
+    }
+    footer?: { location?: 'left' } & ID3PieTextOptions
+    size?: {
+      canvasHeight?: number
+      canvasWidth?: number
+      pieOuterRadius?: string | number
+      pieInnerRadius?: string | number
+    }
+    data: {
+      sortOrder?: 'none' | 'random' | 'value-asc' | 'value-desc' | 'label-asc' | 'label-desc'
+      smallSegmentGrouping?: {
+        enabled?: boolean
+        value?: number
+        valueType?: 'percentage' | 'value'
+        label?: string
+        color?: string
+      }
+      content: {
+        label: string
+        value: number
+        color?: string
+      }[]
+    }
+    labels?: {
+      outer?: { pieDistance?: number } & ID3PieLabelsOptions
+      inner?: ID3PieLabelsOptions
+      mainLabel?: ID3PieStyleOptions
+      percentage?: { decimalPlaces?: number } & ID3PieStyleOptions
+      value?: ID3PieStyleOptions
+      lines?: {
+        enabled?: boolean
+        style?: 'curved' | 'straight'
+        color?: string
+      }
+      truncation?: {
+        enabled?: boolean
+        truncateLength?: number
+      }
+      formatter?: (context: {
+        section: 'outer' | 'inner'
+        value: number
+        label: string
+      }) => string
+    }
+    effects?: {
+      load?: {
+        effect?: 'none' | 'default'
+        speed?: number
+      }
+      pullOutSegmentOnClick?: {
+        effect?: 'none' | 'linear' | 'bounce' | 'elastic' | 'back'
+        speed?: number
+        size?: number
+      }
+      highlightSegmentOnMouseover?: boolean
+      highlightLuminosity?: number
+    }
+    tooltips?: {
       enabled?: boolean
-      value?: number
-      valueType?: 'percentage' | 'value'
-      label?: string
-      color?: string
+      type?: 'placeholder' | 'caption'
+      string?: string
+      placeholderParser?: (index: number, data: { label?: string, percentage?: number, value?: number }) => void
+      styles?: {
+        fadeInSpeed?: number
+        backgroundColor?: string
+        backgroundOpacity?: number
+        color?: string
+        borderRadius?: number
+        font?: string
+        fontSize?: number
+        padding?: number
+      }
     }
-    content: {
-      label: string
-      value: number
-      color?: string
-    }[]
-  }
-  labels?: {
-    outer?: { pieDistance?: number } & ID3PieLabelsOptions
-    inner?: ID3PieLabelsOptions
-    mainLabel?: ID3PieStyleOptions
-    percentage?: { decimalPlaces?: number } & ID3PieStyleOptions
-    value?: ID3PieStyleOptions
-    lines?: {
-      enabled?: boolean
-      style?: 'curved' | 'straight'
-      color?: string
+    misc?: {
+      colors?: {
+        background?: string
+        segments?: string[]
+        segmentStroke?: string
+      }
+      gradient?: {
+        enabled?: boolean
+        percentage?: number
+        color?: string
+      }
+      canvasPadding?: {
+        top?: number
+        right?: number
+        bottom?: number
+        left?: number
+      }
+      pieCenterOffset?: {
+        x?: number
+        y?: number
+      }
+      cssPrefix?: string
     }
-    truncation?: {
-      enabled?: boolean
-      truncateLength?: number
-    }
-    formatter?: (context: {
-      section: 'outer' | 'inner'
-      value: number
-      label: string
-    }) => string
-  }
-  effects?: {
-    load?: {
-      effect?: 'none' | 'default'
-      speed?: number
-    }
-    pullOutSegmentOnClick?: {
-      effect?: 'none' | 'linear' | 'bounce' | 'elastic' | 'back'
-      speed?: number
-      size?: number
-    }
-    highlightSegmentOnMouseover?: boolean
-    highlightLuminosity?: number
-  }
-  tooltips?: {
-    enabled?: boolean
-    type?: 'placeholder' | 'caption'
-    string?: string
-    placeholderParser?: (index: number, data: { label?: string, percentage?: number, value?: number }) => void
-    styles?: {
-      fadeInSpeed?: number
-      backgroundColor?: string
-      backgroundOpacity?: number
-      color?: string
-      borderRadius?: number
-      font?: string
-      fontSize?: number
-      padding?: number
+    callbacks?: {
+      onload?: Function
+      onMouseoverSegment?: Function
+      onMouseoutSegment?: Function
+      onClickSegment?: Function
     }
   }
-  misc?: {
-    colors?: {
-      background?: string
-      segments?: string[]
-      segmentStroke?: string
-    }
-    gradient?: {
-      enabled?: boolean
-      percentage?: number
-      color?: string
-    }
-    canvasPadding?: {
-      top?: number
-      right?: number
-      bottom?: number
-      left?: number
-    }
-    pieCenterOffset?: {
-      x?: number
-      y?: number
-    }
-    cssPrefix?: string
-  }
-  callbacks?: {
-    onload?: Function
-    onMouseoverSegment?: Function
-    onMouseoutSegment?: Function
-    onClickSegment?: Function
+
+  interface ID3PieClass {
+    new (id: string | HTMLElement, options: ID3PieOptions): ID3PieChart
   }
 }
 
-interface ID3PieClass {
-  new (id: string | HTMLElement, options: ID3PieOptions): ID3PieChart
-}
-
-declare const d3pie: ID3PieClass
\ No newline at end of file
+declare const d3pie: d3pie.ID3PieClass
\ No newline at end of file