diff --git a/.gitmodules b/.gitmodules
index 7944e8e32..e69de29bb 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -1,3 +0,0 @@
-[submodule "runtime/PHP"]
-	path = runtime/PHP
-	url = https://github.com/antlr/antlr-php-runtime.git
diff --git a/runtime/PHP b/runtime/PHP
deleted file mode 160000
index 5f4930012..000000000
--- a/runtime/PHP
+++ /dev/null
@@ -1 +0,0 @@
-Subproject commit 5f4930012c1601b0755ae5fc48828c3b0f3823d1