diff --git a/classes/semver.js b/classes/semver.js
index 84e84590..215a0b82 100644
--- a/classes/semver.js
+++ b/classes/semver.js
@@ -31,6 +31,7 @@ class SemVer {
     // this isn't actually relevant for versions, but keep it so that we
     // don't run into trouble passing this.options around.
     this.includePrerelease = !!options.includePrerelease
+    this.isPrerelease = false
 
     const m = version.trim().match(options.loose ? re[t.LOOSE] : re[t.FULL])
 
@@ -178,32 +179,28 @@ class SemVer {
   inc (release, identifier, identifierBase) {
     switch (release) {
       case 'premajor':
-        this.prerelease.length = 0
-        this.patch = 0
-        this.minor = 0
-        this.major++
+        this.isPrerelease = true
+        this.inc('major', identifier, identifierBase)
         this.inc('pre', identifier, identifierBase)
         break
       case 'preminor':
-        this.prerelease.length = 0
-        this.patch = 0
-        this.minor++
+        this.isPrerelease = true
+        this.inc('minor', identifier, identifierBase)
         this.inc('pre', identifier, identifierBase)
         break
       case 'prepatch':
+        this.isPrerelease = true
         // 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
       // If the input is a non-prerelease version, this acts the same as
       // prepatch.
       case 'prerelease':
-        if (this.prerelease.length === 0) {
-          this.inc('patch', identifier, identifierBase)
-        }
+        this.isPrerelease = true
+        this.inc('patch', identifier, identifierBase)
         this.inc('pre', identifier, identifierBase)
         break
 
@@ -218,10 +215,10 @@ class SemVer {
           this.prerelease.length === 0
         ) {
           this.major++
+          this.prerelease = []
         }
         this.minor = 0
         this.patch = 0
-        this.prerelease = []
         break
       case 'minor':
         // If this is a pre-minor version, bump up to the same minor version.
@@ -230,19 +227,19 @@ class SemVer {
         // 1.2.1 bumps to 1.3.0
         if (this.patch !== 0 || this.prerelease.length === 0) {
           this.minor++
+          this.prerelease = []
         }
         this.patch = 0
-        this.prerelease = []
         break
       case 'patch':
         // If this is not a pre-release version, it will increment the patch.
         // If it is a pre-release it will bump up to the same patch version.
-        // 1.2.0-5 patches to 1.2.0
+        // 1.2.0-5 patches to 1.2.1
         // 1.2.0 patches to 1.2.1
-        if (this.prerelease.length === 0) {
+        if (this.prerelease.length === 0 || this.patch === 0) {
           this.patch++
+          this.prerelease = []
         }
-        this.prerelease = []
         break
       // This probably shouldn't be used publicly.
       // 1.0.0 'pre' would become 1.0.0-0 which is the wrong direction.
@@ -291,6 +288,9 @@ class SemVer {
       default:
         throw new Error(`invalid increment argument: ${release}`)
     }
+    if (!this.isPrerelease) {
+      this.prerelease = []
+    }
     this.raw = this.format()
     if (this.build.length) {
       this.raw += `+${this.build.join('.')}`
diff --git a/test/fixtures/increments.js b/test/fixtures/increments.js
index 65e9530b..343a978b 100644
--- a/test/fixtures/increments.js
+++ b/test/fixtures/increments.js
@@ -7,7 +7,7 @@ module.exports = [
   ['1.2.3tag', 'major', '2.0.0', true],
   ['1.2.3-tag', 'major', '2.0.0'],
   ['1.2.3', 'fake', null],
-  ['1.2.0-0', 'patch', '1.2.0'],
+  ['1.2.0-0', 'patch', '1.2.1'],
   ['fake', 'major', null],
   ['1.2.3-4', 'major', '2.0.0'],
   ['1.2.3-4', 'minor', '1.3.0'],
@@ -47,7 +47,7 @@ module.exports = [
   ['1.2.3tag', 'major', '2.0.0', true, 'dev'],
   ['1.2.3-tag', 'major', '2.0.0', false, 'dev'],
   ['1.2.3', 'fake', null, false, 'dev'],
-  ['1.2.0-0', 'patch', '1.2.0', false, 'dev'],
+  ['1.2.0-0', 'patch', '1.2.1', false, 'dev'],
   ['fake', 'major', null, false, 'dev'],
   ['1.2.3-4', 'major', '2.0.0', false, 'dev'],
   ['1.2.3-4', 'minor', '1.3.0', false, 'dev'],
@@ -89,7 +89,7 @@ module.exports = [
   ['1.2.3-1.1', 'prerelease', '1.2.3-2.0', false, '2'],
 
   // [version, inc, result, identifierIndex, loose, identifier]
-  ['1.2.0-1', 'prerelease', '1.2.0-alpha.0', false, 'alpha', '0'],
+  ['1.2.0-1', 'prerelease', '1.2.1-alpha.0', false, 'alpha', '0'],
   ['1.2.1', 'prerelease', '1.2.2-alpha.0', false, 'alpha', '0'],
   ['0.2.0', 'prerelease', '0.2.1-alpha.0', false, 'alpha', '0'],
   ['1.2.2', 'prerelease', '1.2.3-alpha.1', false, 'alpha', '1'],
@@ -107,7 +107,7 @@ module.exports = [
   ['1.2.3-1', 'preminor', '1.3.0-dev.0', false, 'dev'],
   ['1.2.0', 'prerelease', '1.2.1-1', false, '', '1'],
 
-  ['1.2.0-1', 'prerelease', '1.2.0-alpha', false, 'alpha', false],
+  ['1.2.0-1', 'prerelease', '1.2.1-alpha', false, 'alpha', false],
   ['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],
@@ -120,8 +120,13 @@ 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', 'preminor', '1.2.0-beta', false, 'beta', false],
+  ['1.0.0-dev', 'premajor', '1.0.0-beta', false, 'beta', false],
+  ['1.0.0-dev', 'prepatch', '1.0.1-beta', false, 'beta', false],
   ['1.2.0-dev', 'prepatch', '1.2.1-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],
+  ['1.0.0-rc.1+build.4', 'prerelease', '1.0.1-rc', false, 'rc', false],
+  ['1.0.0-rc.1+build.4', 'premajor', '1.0.0-rc.2', false, 'rc', false],
+  ['1.2.0-dev.2', 'preminor', '1.2.0-dev.3', false, 'dev', false],
+
 ]