diff --git a/tools/run_tests/run_tests_matrix.py b/tools/run_tests/run_tests_matrix.py
index a94f9cfef5e1ed777b09e64cbf93b47941c9ee2b..f9313614b916a4926aa4eaaaaeff7b3ef475d517 100755
--- a/tools/run_tests/run_tests_matrix.py
+++ b/tools/run_tests/run_tests_matrix.py
@@ -42,7 +42,7 @@ os.chdir(_ROOT)
 
 # Set the timeout high to allow enough time for sanitizers and pre-building
 # clang docker.
-_RUNTESTS_TIMEOUT = 2*60*60
+_RUNTESTS_TIMEOUT = 3*60*60
 
 # Number of jobs assigned to each run_tests.py instance
 _INNER_JOBS = 2