diff --git a/slither/core/declarations/function.py b/slither/core/declarations/function.py
index 0b44a9e25..b91e58f24 100644
--- a/slither/core/declarations/function.py
+++ b/slither/core/declarations/function.py
@@ -1661,7 +1661,9 @@ def _analyze_calls(self) -> None:
         internal_calls = [item for sublist in internal_calls for item in sublist]
         self._internal_calls = list(set(internal_calls))
 
-        self._solidity_calls = [c for c in internal_calls if isinstance(c, SolidityFunction)]
+        self._solidity_calls = [
+            ir for ir in internal_calls if isinstance(ir.function, SolidityFunction)
+        ]
 
         low_level_calls = [x.low_level_calls for x in self.nodes]
         low_level_calls = [x for x in low_level_calls if x]