diff --git a/src/SnackbarProvider.tsx b/src/SnackbarProvider.tsx
index fc9afaf8..19980e9b 100644
--- a/src/SnackbarProvider.tsx
+++ b/src/SnackbarProvider.tsx
@@ -2,7 +2,7 @@ import React, { Component } from 'react';
 import { createPortal } from 'react-dom';
 import clsx from 'clsx';
 import SnackbarContext from './SnackbarContext';
-import { MESSAGES, REASONS, originKeyExtractor, omitContainerKeys } from './utils/constants';
+import { MESSAGES, REASONS, originKeyExtractor, omitContainerKeys, merge, DEFAULTS } from './utils/constants';
 import SnackbarItem from './SnackbarItem';
 import SnackbarContainer from './SnackbarContainer';
 import warning from './utils/warning';
@@ -51,6 +51,8 @@ class SnackbarProvider extends Component<SnackbarProviderProps, State> {
     enqueueSnackbar = (message: SnackbarMessage, { key, preventDuplicate, ...options }: OptionsObject = {}): SnackbarKey => {
         const hasSpecifiedKey = key || key === 0;
         const id = hasSpecifiedKey ? (key as SnackbarKey) : new Date().getTime() + Math.random();
+
+        const merger = merge(options, this.props, DEFAULTS);
         const snack: Snack = {
             key: id,
             ...options,
@@ -58,9 +60,9 @@ class SnackbarProvider extends Component<SnackbarProviderProps, State> {
             open: true,
             entered: false,
             requestClose: false,
-            variant: options.variant || this.props.variant || 'default',
-            autoHideDuration: options.autoHideDuration || this.props.autoHideDuration || 5000,
-            anchorOrigin: options.anchorOrigin || this.props.anchorOrigin || { vertical: 'bottom', horizontal: 'left' },
+            variant: merger('variant'),
+            anchorOrigin: merger('anchorOrigin'),
+            autoHideDuration: merger('autoHideDuration'),
         };
 
         if (options.persist) {
diff --git a/src/utils/constants.ts b/src/utils/constants.ts
index d45a812c..0556e9d2 100644
--- a/src/utils/constants.ts
+++ b/src/utils/constants.ts
@@ -50,6 +50,30 @@ export const omitContainerKeys = (classes: SnackbarProviderProps['classes']): Sn
     Object.keys(classes).filter(key => !allClasses.container[key]).reduce((obj, key) => ({ ...obj, [key]: classes[key] }), {})
 );
 
+export const DEFAULTS = {
+    variant: 'default',
+    autoHideDuration: 5000,
+    anchorOrigin: {
+        vertical: 'bottom',
+        horizontal: 'left',
+    },
+};
+
+const numberOrNull = (numberish?: number | null) => (
+    typeof numberish === 'number' || numberish === null
+);
+
+// @ts-ignore
+export const merge = (options, props, defaults) => (name: keyof Snack): any => {
+    if (name === 'autoHideDuration') {
+        if (numberOrNull(options.autoHideDuration)) return options.autoHideDuration;
+        if (numberOrNull(props.autoHideDuration)) return props.autoHideDuration;
+        return DEFAULTS.autoHideDuration;
+    }
+
+    return options[name] || props[name] || defaults[name];
+};
+
 export const REASONS: { [key: string]: CloseReason } = {
     CLICKAWAY: 'clickaway',
     MAXSNACK: 'maxsnack',