diff --git a/clang-tools-extra/test/clang-tidy/checkers/cppcoreguidelines-macro-usage-custom.cpp b/clang-tools-extra/test/clang-tidy/checkers/cppcoreguidelines-macro-usage-custom.cpp
index e25eae323094..b3075324efdb 100644
--- a/clang-tools-extra/test/clang-tidy/checkers/cppcoreguidelines-macro-usage-custom.cpp
+++ b/clang-tools-extra/test/clang-tidy/checkers/cppcoreguidelines-macro-usage-custom.cpp
@@ -1,3 +1,6 @@
+// FIXME: PR48646
+// UNSUPPORTED: system-windows
+
 // RUN: %check_clang_tidy %s cppcoreguidelines-macro-usage %t \
 // RUN: -config='{CheckOptions: \
 // RUN:  [{key: cppcoreguidelines-macro-usage.AllowedRegexp, value: "DEBUG_*|TEST_*"}]}' --
diff --git a/clang-tools-extra/test/clang-tidy/checkers/readability-identifier-naming-ignored-regexp.cpp b/clang-tools-extra/test/clang-tidy/checkers/readability-identifier-naming-ignored-regexp.cpp
index e99edff5cc21..625b7dc9134a 100644
--- a/clang-tools-extra/test/clang-tidy/checkers/readability-identifier-naming-ignored-regexp.cpp
+++ b/clang-tools-extra/test/clang-tidy/checkers/readability-identifier-naming-ignored-regexp.cpp
@@ -1,3 +1,6 @@
+// FIXME: PR48646
+// UNSUPPORTED: system-windows
+
 // RUN: %check_clang_tidy %s readability-identifier-naming %t -- \
 // RUN:   -config='{CheckOptions: [ \
 // RUN:     {key: readability-identifier-naming.ParameterCase, value: CamelCase}, \