diff --git a/his_checker.py b/his_checker.py
index 94e66e3..22ddc98 100755
--- a/his_checker.py
+++ b/his_checker.py
@@ -71,8 +71,34 @@ def process_calls(files):
     print(f"== Check done with {metric_fail} error(s) ==\n")
     return metric_fail
 
+def process_recursive(files):
+
+    """Detect if there are any recursive functions."""
+
+    metric_fail = 0
+    cflow = "cflow -l -r "
+    print("== Checking the number of recursive functions ==")
+    pattern = r'\{\s*(\d+)\}\s+(.+?)\s+<(.+?)\sat\s(.+):(\d+)> \(R\)'
+    pattern_re = re.compile(pattern)
+    for file in files.files:
+        if file.endswith(".c"):
+            cflow_output = os.popen(f"{cflow} {file}").read()
+            matches = pattern_re.findall(cflow_output)
+            for match in matches:
+                depth = int(match[0])
+                if depth == 0:
+                    file_path = match[3]
+                    function = match[2]
+                    line_number = match[4]
+                    print(f"At {file_path.split('src', 1)[1]} ({line_number}): "
+                          f"{function} is a recursive function. "
+                          f"Recursive functions are not allowed.")
+                    metric_fail += 1
+    print(f"== Check done with {metric_fail} error(s) ==\n")
+    return metric_fail
+
 if __name__ == "__main__":
-    METRICS_LIST = [process_complexity, process_calls]
+    METRICS_LIST = [process_complexity, process_calls, process_recursive]
     CHECK_FAIL = 0
     PARSER = argparse.ArgumentParser()
     PARSER.add_argument("files", nargs="+", help="The files to process")