diff --git a/classes/semver.js b/classes/semver.js
index 54381272..33480a0f 100644
--- a/classes/semver.js
+++ b/classes/semver.js
@@ -223,23 +223,14 @@ class SemVer {
 
     switch (release) {
       case 'premajor':
-        this.prerelease.length = 0
-        this.patch = 0
-        this.minor = 0
-        this.major++
+        this.inc('major', identifier, identifierBase)
         this.inc('pre', identifier, identifierBase)
         break
       case 'preminor':
-        this.prerelease.length = 0
-        this.patch = 0
-        this.minor++
+        this.inc('minor', identifier, identifierBase)
         this.inc('pre', identifier, identifierBase)
         break
       case 'prepatch':
-        // If this is already a prerelease, it will bump to the next version
-        // drop any prereleases that might already exist, since they are not
-        // relevant at this point.
-        this.prerelease.length = 0
         this.inc('patch', identifier, identifierBase)
         this.inc('pre', identifier, identifierBase)
         break
diff --git a/test/fixtures/increments.js b/test/fixtures/increments.js
index 31ea6974..744db26f 100644
--- a/test/fixtures/increments.js
+++ b/test/fixtures/increments.js
@@ -39,7 +39,7 @@ module.exports = [
   ['1.2.3-alpha.11.beta', 'prerelease', '1.2.3-alpha.12.beta'],
   ['1.0.0', 'prepatch', '1.0.1-alpha.1.1a.0', null, 'alpha.1.1a'],
   ['1.2.0', 'prepatch', '1.2.1-0'],
-  ['1.2.0-1', 'prepatch', '1.2.1-0'],
+  ['1.2.0-1', 'prepatch', '1.2.0-0'],
   ['1.2.0', 'preminor', '1.3.0-0'],
   ['1.2.3-1', 'preminor', '1.3.0-0'],
   ['1.2.0', 'premajor', '2.0.0-0'],
@@ -88,7 +88,7 @@ module.exports = [
   ['1.2.3-alpha.10.beta', 'prerelease', '1.2.3-alpha.11.beta', false, 'alpha'],
   ['1.2.3-alpha.11.beta', 'prerelease', '1.2.3-alpha.12.beta', false, 'alpha'],
   ['1.2.0', 'prepatch', '1.2.1-dev.0', false, 'dev'],
-  ['1.2.0-1', 'prepatch', '1.2.1-dev.0', false, 'dev'],
+  ['1.2.0-1', 'prepatch', '1.2.0-dev.0', false, 'dev'],
   ['1.2.0', 'preminor', '1.3.0-dev.0', false, 'dev'],
   ['1.2.3-1', 'preminor', '1.3.0-dev.0', false, 'dev'],
   ['1.2.0', 'premajor', '2.0.0-dev.0', false, 'dev'],
@@ -110,7 +110,7 @@ module.exports = [
   ['1.2.3', 'prerelease', '1.2.4-alpha.1', false, 'alpha', '1'],
   ['1.2.4', 'prerelease', '1.2.5-alpha.1', false, 'alpha', '1'],
   ['1.2.0', 'prepatch', '1.2.1-dev.1', false, 'dev', '1'],
-  ['1.2.0-1', 'prepatch', '1.2.1-dev.1', false, 'dev', '1'],
+  ['1.2.0-1', 'prepatch', '1.2.0-dev.1', false, 'dev', '1'],
   ['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'],
@@ -125,7 +125,7 @@ module.exports = [
   ['1.2.1', 'prerelease', '1.2.2-alpha', false, 'alpha', false],
   ['1.2.2', 'prerelease', '1.2.3-alpha', false, 'alpha', false],
   ['1.2.0', 'prepatch', '1.2.1-dev', false, 'dev', false],
-  ['1.2.0-1', 'prepatch', '1.2.1-dev', false, 'dev', false],
+  ['1.2.0-1', 'prepatch', '1.2.0-dev', false, 'dev', false],
   ['1.2.0', 'premajor', '2.0.0-dev', false, 'dev', false],
   ['1.2.3-1', 'premajor', '2.0.0-dev', false, 'dev', false],
   ['1.2.3-dev.bar', 'prerelease', '1.2.3-dev', false, 'dev', false],
@@ -134,8 +134,8 @@ module.exports = [
   ['1.2.3-1', 'preminor', '1.3.0-dev', false, 'dev', false],
   ['1.2.3-dev', 'prerelease', null, false, 'dev', false],
   ['1.2.0-dev', 'premajor', '2.0.0-dev', false, 'dev', false],
-  ['1.2.0-dev', 'preminor', '1.3.0-beta', false, 'beta', false],
-  ['1.2.0-dev', 'prepatch', '1.2.1-dev', false, 'dev', false],
+  ['1.2.0-dev', 'preminor', '1.2.0-beta', false, 'beta', false],
+  ['1.2.0-dev', 'prepatch', '1.2.0-dev', false, 'dev', false],
   ['1.2.0', 'prerelease', null, false, '', false],
   ['1.0.0-rc.1+build.4', 'prerelease', '1.0.0-rc.2', 'rc', false],
   ['1.2.0', 'prerelease', null, false, 'invalid/preid'],