diff --git a/share/analysis-scripts/estimate_difficulty.py b/share/analysis-scripts/estimate_difficulty.py
index 429bd786ee60482bd275af24d5343d2e67016f8f..13ad4fec48a3468d47280922239ade96811b04b9 100755
--- a/share/analysis-scripts/estimate_difficulty.py
+++ b/share/analysis-scripts/estimate_difficulty.py
@@ -263,7 +263,9 @@ if dyncallees:
 
 # unsupported C11-specific features
 
-c11_unsupported = ["_Alignas", "_Alignof", "_Complex", "_Generic", "_Imaginary"]
+c11_unsupported = ["_Alignas", "_Alignof", "_Complex", "_Generic", "_Imaginary",
+                   "alignas", "alignof" # stdalign.h may use these symbols instead of the C11 keywords
+                   ];
 
 for keyword in c11_unsupported:
     out = subprocess.Popen(["grep", "-n", '\\b' + keyword + '\\b'] + files + ["/dev/null"],