diff --git a/aesara/configdefaults.py b/aesara/configdefaults.py
index b1e914b2a9..cbfd3be113 100644
--- a/aesara/configdefaults.py
+++ b/aesara/configdefaults.py
@@ -548,6 +548,13 @@ def add_compile_configvars():
         in_c_key=False,
     )
 
+    if sys.platform == "darwin":
+        # Resolves C++11 narrowing error on Mac OS
+        # https://github.com/aesara-devs/aesara/issues/127
+        no_cpp_narrowing_flag = "-Wno-c++11-narrowing"
+        if no_cpp_narrowing_flag not in config.gcc__cxxflags:
+            config.gcc__cxxflags += " " + no_cpp_narrowing_flag
+
     config.add(
         "cmodule__warn_no_version",
         "If True, will print a warning when compiling one or more Op "