diff --git a/common/test.cc b/common/test.cc
index 7c7805d3..4abb7669 100644
--- a/common/test.cc
+++ b/common/test.cc
@@ -1,5 +1,5 @@
 #define CATCH_CONFIG_MAIN // request a main()
-#include <Catch2/catch.hpp>
+#include <catch2/catch.hpp>
 
 #include "common/settings.hh"
 
diff --git a/light/test.cc b/light/test.cc
index ecefaa92..04ac319b 100644
--- a/light/test.cc
+++ b/light/test.cc
@@ -1,2 +1,2 @@
 #define CATCH_CONFIG_MAIN // request a main()
-#include <Catch2/catch.hpp>
\ No newline at end of file
+#include <catch2/catch.hpp>
\ No newline at end of file
diff --git a/light/test_common.cc b/light/test_common.cc
index 7f651cf8..802298e0 100644
--- a/light/test_common.cc
+++ b/light/test_common.cc
@@ -1,4 +1,4 @@
-#include <Catch2/catch.hpp>
+#include <catch2/catch.hpp>
 
 #include <filesystem>
 #include <string>
diff --git a/light/test_entities.cc b/light/test_entities.cc
index 97ea16d6..d1e99e6c 100644
--- a/light/test_entities.cc
+++ b/light/test_entities.cc
@@ -1,4 +1,4 @@
-#include <Catch2/catch.hpp>
+#include <catch2/catch.hpp>
 
 #include <light/entities.hh>
 #include <vector>
diff --git a/light/test_light.cc b/light/test_light.cc
index 54c1794e..a8d4903e 100644
--- a/light/test_light.cc
+++ b/light/test_light.cc
@@ -1,4 +1,4 @@
-#include <Catch2/catch.hpp>
+#include <catch2/catch.hpp>
 
 #include <light/light.hh>
 #include <light/entities.hh>
diff --git a/light/test_ltface.cc b/light/test_ltface.cc
index 37e38563..a5fc9d9c 100644
--- a/light/test_ltface.cc
+++ b/light/test_ltface.cc
@@ -1,3 +1,3 @@
-#include <Catch2/catch.hpp>
+#include <catch2/catch.hpp>
 
 #include <light/ltface.hh>
diff --git a/qbsp/test.cc b/qbsp/test.cc
index 1a272923..60da99d7 100644
--- a/qbsp/test.cc
+++ b/qbsp/test.cc
@@ -1,2 +1,2 @@
 #define CATCH_CONFIG_MAIN // request a main()
-#include <Catch2/catch.hpp>
+#include <catch2/catch.hpp>
diff --git a/qbsp/test_qbsp.cc b/qbsp/test_qbsp.cc
index a2e188a1..7b950b44 100644
--- a/qbsp/test_qbsp.cc
+++ b/qbsp/test_qbsp.cc
@@ -1,4 +1,4 @@
-#include <Catch2/catch.hpp>
+#include <catch2/catch.hpp>
 
 #include <qbsp/brush.hh>
 #include <qbsp/qbsp.hh>