diff --git a/master_changes.md b/master_changes.md
index 10482a0b06a..2aeb2d1122d 100644
--- a/master_changes.md
+++ b/master_changes.md
@@ -111,7 +111,7 @@ users)
 
 ### Engine
   * With real path resolved for all opam temp dir, remove `/private` from mac temp dir regexp [#5654 @rjbou]
-  * Reimplement `sed-cmd` command regexp, to handle prefixed commands with path not only in subprocess, but anywere in output [#5657 @rjbou]
+  * Reimplement `sed-cmd` command regexp, to handle prefixed commands with path not only in subprocess, but anywere in output [#5657 #5607 @rjbou]
 
 ## Github Actions
   * Add coreutils install for cheksum validation tests [#5560 @rjbou]
diff --git a/tests/reftests/run.ml b/tests/reftests/run.ml
index 265face0f44..60814411ee9 100644
--- a/tests/reftests/run.ml
+++ b/tests/reftests/run.ml
@@ -468,8 +468,9 @@ module Parse = struct
               *)
               opt_quoted @@ [
                 alpha; char ':';
-                rep1 @@ seq [ char '\\'; rep1 @@ diff any (with_quote_set "\\") ];
-                char '\\';
+                rep1 @@ seq [ char '\\'; opt @@ char '\\';
+                              rep1 @@ diff any (with_quote_set "\\") ];
+                char '\\'; opt @@ char '\\';
                 Re.str cmd;
                 opt @@ Re.str ".exe";
               ] in