diff --git a/.gitmodules b/.gitmodules
index ec6c1cd..d67e78f 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -4,12 +4,6 @@
 [submodule "ext/bitshuffle"]
 	path = ext/bitshuffle
 	url = https://github.com/kiyo-masui/bitshuffle.git
-[submodule "bitshuffle"]
-	path = bitshuffle
-	url = https://github.com/kiyo-masui/bitshuffle.git
-[submodule "lz4"]
-	path = lz4
-	url = https://github.com/lz4/lz4.git
-[submodule "zstd"]
-	path = zstd
+[submodule "ext/zstd"]
+	path = ext/zstd
 	url = https://github.com/facebook/zstd.git
diff --git a/bitshuffle b/bitshuffle
deleted file mode 160000
index b9a1546..0000000
--- a/bitshuffle
+++ /dev/null
@@ -1 +0,0 @@
-Subproject commit b9a1546133959298c56eee686932dbb18ff80f7a
diff --git a/zstd b/ext/zstd
similarity index 100%
rename from zstd
rename to ext/zstd
diff --git a/lz4 b/lz4
deleted file mode 160000
index 202d647..0000000
--- a/lz4
+++ /dev/null
@@ -1 +0,0 @@
-Subproject commit 202d647ff420d614bd16adf5257ad79580eaeb1c