diff --git a/clangd/test/compile-commands-path-in-initialize.test b/clangd/test/compile-commands-path-in-initialize.test
index 2905bad..034299d 100644
--- a/clangd/test/compile-commands-path-in-initialize.test
+++ b/clangd/test/compile-commands-path-in-initialize.test
@@ -10,7 +10,7 @@
 
 # On Windows, we need the URI in didOpen to look like "uri":"file:///C:/..."
 # (with the extra slash in the front), so we add it here.
-# RUN: sed -e "s|file://\([A-Z]\):/|file:///\1:/|g" %t.test.1 > %t.test
+# RUN: sed -E -e "s|file://([A-Z]):/|file:///\1:/|g" %t.test.1 > %t.test
 
 # RUN: clangd -lit-test < %t.test | FileCheck -strict-whitespace %t.test
 
diff --git a/clangd/test/system-include-extractor.test b/clangd/test/system-include-extractor.test
index 431384d..b61ad7a 100644
--- a/clangd/test/system-include-extractor.test
+++ b/clangd/test/system-include-extractor.test
@@ -27,7 +27,7 @@
 # RUN: sed -e "s|INPUT_DIR|%/t.dir|g" %s > %t.test.1
 # On Windows, we need the URI in didOpen to look like "uri":"file:///C:/..."
 # (with the extra slash in the front), so we add it here.
-# RUN: sed -e "s|file://\([A-Z]\):/|file:///\1:/|g" %t.test.1 > %t.test
+# RUN: sed -E -e "s|file://([A-Z]):/|file:///\1:/|g" %t.test.1 > %t.test
 
 # Bless the mock driver we've just created so that clangd can execute it.
 # RUN: clangd -lit-test -query-driver="**.test,**.sh" < %t.test | FileCheck -strict-whitespace %t.test
diff --git a/clangd/test/target_info.test b/clangd/test/target_info.test
index 1e0cb99..ae45c34 100644
--- a/clangd/test/target_info.test
+++ b/clangd/test/target_info.test
@@ -9,7 +9,7 @@
 # RUN: sed -e "s|INPUT_DIR|%/t.dir|g" %s > %t.test.1
 # On Windows, we need the URI in didOpen to look like "uri":"file:///C:/..."
 # (with the extra slash in the front), so we add it here.
-# RUN: sed -e "s|file://\([A-Z]\):/|file:///\1:/|g" %t.test.1 > %t.test
+# RUN: sed -E -e "s|file://([A-Z]):/|file:///\1:/|g" %t.test.1 > %t.test
 
 # RUN: clangd -lit-test < %t.test 2>&1 | FileCheck -strict-whitespace %t.test
 {"jsonrpc":"2.0","id":0,"method":"initialize","params":{}}