diff --git a/src/scripts/extensions/blackfire.ps1 b/src/scripts/extensions/blackfire.ps1
index 780138098..4afe8ed11 100644
--- a/src/scripts/extensions/blackfire.ps1
+++ b/src/scripts/extensions/blackfire.ps1
@@ -22,6 +22,8 @@ Function Add-Blackfire() {
     } else {
         $nts = if (!$installed.ThreadSafe) { "_nts" } else { "" }
         Get-File -Url "https://packages.blackfire.io/binaries/blackfire-php/${extension_version}/blackfire-php-windows_${arch}-php-${no_dot_version}${nts}.dll" -OutFile $ext_dir\blackfire.dll > $null 2>&1
+        Disable-Extension xdebug > $null 2>&1
+        Disable-Extension pcov > $null 2>&1
         Enable-PhpExtension -Extension blackfire -Path $php_dir
         $status="Installed and enabled"
     }
diff --git a/src/scripts/extensions/blackfire.sh b/src/scripts/extensions/blackfire.sh
index fa37e952f..bea20f248 100644
--- a/src/scripts/extensions/blackfire.sh
+++ b/src/scripts/extensions/blackfire.sh
@@ -17,6 +17,8 @@ add_blackfire() {
     fi
     get -q -n "${ext_dir:?}/blackfire.so" https://packages.blackfire.io/binaries/blackfire-php/"$extension_version"/blackfire-php-"$platform"_amd64-php-"$no_dot_version".so >/dev/null 2>&1
   fi
+  disable_extension xdebug >/dev/null 2>&1
+  disable_extension pcov >/dev/null 2>&1
   enable_extension blackfire extension
   add_extension_log blackfire "$status"
 }