diff --git a/share/analysis-scripts/estimate_difficulty.py b/share/analysis-scripts/estimate_difficulty.py
index 0f37fb1de1171e2d8b07f5027aa741b40fe03316..a094921366e2f00270798b25a329383c19e5d08a 100755
--- a/share/analysis-scripts/estimate_difficulty.py
+++ b/share/analysis-scripts/estimate_difficulty.py
@@ -244,7 +244,7 @@ if dyncallees:
 
 # unsupported C11-specific features
 
-c11_unsupported = ["_Alignas", "_Alignof", "_Generic", "_Static_assert"]
+c11_unsupported = ["_Alignas", "_Alignof", "_Complex", "_Generic", "_Imaginary"]
 
 for keyword in c11_unsupported:
     out = subprocess.Popen(["grep", "-n", '\\b' + keyword + '\\b'] + files + ["/dev/null"],