diff --git a/classes/semver.js b/classes/semver.js
index 20eb0897..96fceb79 100644
--- a/classes/semver.js
+++ b/classes/semver.js
@@ -176,6 +176,7 @@ class SemVer {
   // preminor will bump the version up to the next minor release, and immediately
   // down to pre-release. premajor and prepatch work the same way.
   inc (release, identifier, identifierBase) {
+    const base = Number(identifierBase) ? 1 : 0
     switch (release) {
       case 'premajor':
         this.prerelease.length = 0
@@ -248,7 +249,7 @@ class SemVer {
       // 1.0.0 'pre' would become 1.0.0-0 which is the wrong direction.
       case 'pre':
         if (this.prerelease.length === 0) {
-          this.prerelease = [0]
+          this.prerelease = [base]
         } else {
           let i = this.prerelease.length
           while (--i >= 0) {
@@ -259,11 +260,10 @@ class SemVer {
           }
           if (i === -1) {
             // didn't increment anything
-            this.prerelease.push(0)
+            this.prerelease.push(base)
           }
         }
         if (identifier) {
-          const base = Number(identifierBase) ? 1 : 0
           // 1.2.0-beta.1 bumps to 1.2.0-beta.2,
           // 1.2.0-beta.fooblz or 1.2.0-beta bumps to 1.2.0-beta.0
           if (compareIdentifiers(this.prerelease[0], identifier) === 0) {
diff --git a/test/fixtures/increments.js b/test/fixtures/increments.js
index dedd02e6..b1f1f2fd 100644
--- a/test/fixtures/increments.js
+++ b/test/fixtures/increments.js
@@ -79,6 +79,7 @@ module.exports = [
   ['1.2.3-1', 'preminor', '1.3.0-dev.0', false, 'dev'],
   ['1.2.0', 'premajor', '2.0.0-dev.0', false, 'dev'],
   ['1.2.3-1', 'premajor', '2.0.0-dev.0', false, 'dev'],
+  ['1.2.3-1', 'premajor', '2.0.0-dev.1', false, 'dev', 1],
   ['1.2.0-1', 'minor', '1.2.0', false, 'dev'],
   ['1.0.0-1', 'major', '1.0.0', 'dev'],
   ['1.2.3-dev.bar', 'prerelease', '1.2.3-dev.0', false, 'dev'],
@@ -99,6 +100,10 @@ module.exports = [
   ['1.2.0', 'premajor', '2.0.0-dev.0', false, 'dev', '0'],
   ['1.2.3-1', 'premajor', '2.0.0-dev.0', false, 'dev', '0'],
   ['1.2.3-dev.bar', 'prerelease', '1.2.3-dev.0', false, 'dev', '0'],
+  ['1.2.3-dev.bar', 'prerelease', '1.2.3-dev.1', false, 'dev', '1'],
+  ['1.2.3-dev.bar', 'prerelease', '1.2.3-dev.bar.0', false, '', '0'],
+  ['1.2.3-dev.bar', 'prerelease', '1.2.3-dev.bar.1', false, '', '1'],
   ['1.2.0', 'preminor', '1.3.0-dev.1', false, 'dev', '1'],
   ['1.2.3-1', 'preminor', '1.3.0-dev.0', false, 'dev'],
+  ['1.2.0', 'prerelease', '1.2.1-1', false, '', '1'],
 ]