diff --git a/.gitmodules b/.gitmodules
index b0d663e188..d557cee15d 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -88,11 +88,6 @@
 	url = ../io.git
 	fetchRecurseSubmodules = on-demand
 	branch = .
-[submodule "disjoint_sets"]
-	path = libs/disjoint_sets
-	url = ../disjoint_sets.git
-	fetchRecurseSubmodules = on-demand
-	branch = .
 [submodule "units"]
 	path = libs/units
 	url = ../units.git
diff --git a/libs/disjoint_sets b/libs/disjoint_sets
deleted file mode 160000
index a7a821df51..0000000000
--- a/libs/disjoint_sets
+++ /dev/null
@@ -1 +0,0 @@
-Subproject commit a7a821df515a2dd450a3b6b05a9ccf330b026777