diff --git a/repos/spack_repo/builtin/packages/py_fprettify/fprettify370_pr176.patch b/repos/spack_repo/builtin/packages/py_fprettify/fprettify370_pr176.patch
new file mode 100644
index 00000000000..a2212412aef
--- /dev/null
+++ b/repos/spack_repo/builtin/packages/py_fprettify/fprettify370_pr176.patch
@@ -0,0 +1,13 @@
+diff --git a/fprettify/__init__.py b/fprettify/__init__.py
+index d6450a3..76add49 100644
+--- a/fprettify/__init__.py
++++ b/fprettify/__init__.py
+@@ -269,7 +269,7 @@ class plusminus_parser(parser_re):
+ LR_OPS_RE = [REL_OP_RE, LOG_OP_RE, plusminus_parser(PLUSMINUS_RE), MULTDIV_RE, PRINT_RE]
+ 
+ USE_RE = re.compile(
+-    SOL_STR + "USE(\s+|(,.+?)?::\s*)\w+?((,.+?=>.+?)+|,\s*only\s*:.+?)?$" + EOL_STR, RE_FLAGS)
++    SOL_STR + r"USE(\s+|(,.+?)?::\s*)\w+?((,.+?=>.+?)+|,\s*only\s*:.+?)?$" + EOL_STR, RE_FLAGS)
+ 
+ # markups to deactivate formatter
+ NO_ALIGN_RE = re.compile(SOL_STR + r"&\s*[^\s*]+")
diff --git a/repos/spack_repo/builtin/packages/py_fprettify/package.py b/repos/spack_repo/builtin/packages/py_fprettify/package.py
index f22e1580793..4d86a14e8c8 100644
--- a/repos/spack_repo/builtin/packages/py_fprettify/package.py
+++ b/repos/spack_repo/builtin/packages/py_fprettify/package.py
@@ -20,3 +20,5 @@ class PyFprettify(PythonPackage):
 
     depends_on("py-setuptools", type="build")
     depends_on("py-configargparse", type=("build", "run"))
+
+    patch("fprettify370_pr176.patch", when="@0.3.7")