diff --git a/packages/gatsby-source-mongodb/src/__tests__/sanitize-name.js b/packages/gatsby-source-mongodb/src/__tests__/sanitize-name.js
new file mode 100644
index 0000000000000..4edbf698d9e19
--- /dev/null
+++ b/packages/gatsby-source-mongodb/src/__tests__/sanitize-name.js
@@ -0,0 +1,7 @@
+const sanitizeName = require(`../sanitize-name`)
+
+it(`removes unsupported characters from name`, () => {
+  const name = `one-two-three`
+  const output = sanitizeName(name)
+  expect(output).not.toContain(`-`)
+})
diff --git a/packages/gatsby-source-mongodb/src/gatsby-node.js b/packages/gatsby-source-mongodb/src/gatsby-node.js
index 0a80143ff187a..299c83825aab1 100644
--- a/packages/gatsby-source-mongodb/src/gatsby-node.js
+++ b/packages/gatsby-source-mongodb/src/gatsby-node.js
@@ -1,6 +1,7 @@
 const MongoClient = require(`mongodb`).MongoClient
 const crypto = require(`crypto`)
 const prepareMappingChildNode = require(`./mapping`)
+const sanitizeName = require(`./sanitize-name`)
 const queryString = require(`query-string`)
 
 exports.sourceNodes = (
@@ -130,10 +131,6 @@ function createNodes(
   })
 }
 
-function sanitizeName(s) {
-  return s.replace(/[^_a-zA-Z0-9]/, ``).replace(/\b\w/g, l => l.toUpperCase())
-}
-
 function getConnectionExtraParams(extraParams) {
   let connectionSuffix
   if (extraParams) {
diff --git a/packages/gatsby-source-mongodb/src/sanitize-name.js b/packages/gatsby-source-mongodb/src/sanitize-name.js
new file mode 100644
index 0000000000000..2487eb8eb92c3
--- /dev/null
+++ b/packages/gatsby-source-mongodb/src/sanitize-name.js
@@ -0,0 +1,3 @@
+module.exports = function sanitizeName(s) {
+  return s.replace(/[^_a-zA-Z0-9]/g, ``).replace(/\b\w/g, l => l.toUpperCase())
+}