diff --git a/src/PSCredentialStore.psd1 b/src/PSCredentialStore.psd1
index 0498f08..69f08ce 100644
--- a/src/PSCredentialStore.psd1
+++ b/src/PSCredentialStore.psd1
@@ -12,7 +12,8 @@
     RootModule = 'PSCredentialStore'
 
     # Version number of this module.
-    ModuleVersion = $Env:APPVEYOR_BUILD_VERSION
+    # Do not touch the version number. It gets replaced in the build process.
+    ModuleVersion = '0.0.0.9999'
 
     # Supported PSEditions
     # CompatiblePSEditions = @()
diff --git a/tools/AppVeyor.psm1 b/tools/AppVeyor.psm1
index 63d5343..58f916d 100644
--- a/tools/AppVeyor.psm1
+++ b/tools/AppVeyor.psm1
@@ -19,7 +19,7 @@ Function Invoke-AppVeyorBumpVersion() {
 
     Try {
         $ModManifest = Get-Content -Path (".\src\{0}.psd1" -f $CALLSIGN)
-        $BumpedManifest = $ModManifest -replace '\$Env:APPVEYOR_BUILD_VERSION', "'$Env:APPVEYOR_BUILD_VERSION'"
+        $BumpedManifest = $ModManifest -replace '0.0.0.9999', $Env:APPVEYOR_BUILD_VERSION
         Remove-Item -Path (".\src\{0}.psd1" -f $CALLSIGN)
         Out-File -FilePath (".\src\{0}.psd1" -f $CALLSIGN) -InputObject $BumpedManifest -NoClobber -Encoding utf8 -Force
     }