diff --git a/php-packages.nix b/php-packages.nix
index 2cbe786..48cc20d 100644
--- a/php-packages.nix
+++ b/php-packages.nix
@@ -18,7 +18,7 @@ in
 composerEnv.buildPackage {
   inherit packages devPackages noDev;
   name = "svanderburg-composer2nix";
-  src = ./.;
+  src = composerEnv.filterSrc ./.;
   executable = true;
   symlinkDependencies = false;
   meta = {
diff --git a/src/Composer2Nix/Package.php b/src/Composer2Nix/Package.php
index 51f5581..17db536 100644
--- a/src/Composer2Nix/Package.php
+++ b/src/Composer2Nix/Package.php
@@ -67,7 +67,7 @@ class Package extends NixASTNode
 	{
 		return new NixFunInvocation(new NixExpression("composerEnv.buildPackage"), array(
 			"name" => $this->composerConfig->packageName,
-			"src" => new NixFile("./."),
+			"src" => new NixFunInvocation(new NixExpression("composerEnv.filterSrc"), new NixFile("./.")),
 			"executable" => $this->executable,
 			"packages" => new NixInherit(),
 			"devPackages" => new NixInherit(),
diff --git a/src/Composer2Nix/composer-env.nix b/src/Composer2Nix/composer-env.nix
index e1cffa8..71714b7 100644
--- a/src/Composer2Nix/composer-env.nix
+++ b/src/Composer2Nix/composer-env.nix
@@ -4,6 +4,10 @@
 
 let
   inherit (phpPackages) composer;
+
+  filterSrc = src:
+    builtins.filterSource (path: type: type != "directory" || (baseNameOf path != ".git" && baseNameOf path != ".git" && baseNameOf path != ".svn")) src;
+
   buildZipPackage = { name, src }:
     stdenv.mkDerivation {
       inherit name src;
@@ -233,6 +237,7 @@ let
   } // extraArgs);
 in
 {
+  inherit filterSrc;
   composer = lib.makeOverridable composer;
   buildZipPackage = lib.makeOverridable buildZipPackage;
   buildPackage = lib.makeOverridable buildPackage;
diff --git a/tests/dependencies/php-packages.nix b/tests/dependencies/php-packages.nix
index a093d04..6645b2a 100644
--- a/tests/dependencies/php-packages.nix
+++ b/tests/dependencies/php-packages.nix
@@ -377,7 +377,7 @@ in
 composerEnv.buildPackage {
   inherit packages devPackages noDev;
   name = "dependencies";
-  src = ./.;
+  src = composerEnv.filterSrc ./.;
   executable = false;
   symlinkDependencies = false;
   meta = {};
diff --git a/tests/enduser/php-packages.nix b/tests/enduser/php-packages.nix
index b83f881..c596e6a 100644
--- a/tests/enduser/php-packages.nix
+++ b/tests/enduser/php-packages.nix
@@ -348,7 +348,7 @@ in
 composerEnv.buildPackage {
   inherit packages devPackages noDev;
   name = "phpunit-phpunit";
-  src = ./.;
+  src = composerEnv.filterSrc ./.;
   executable = true;
   symlinkDependencies = false;
   meta = {};