diff --git a/libyul/optimiser/FullInliner.cpp b/libyul/optimiser/FullInliner.cpp
index 95360dc32..1f267f960 100644
--- a/libyul/optimiser/FullInliner.cpp
+++ b/libyul/optimiser/FullInliner.cpp
@@ -80,9 +80,9 @@ void FullInliner::run()
 	}
 }
 
-void FullInliner::updateCodeSize(FunctionDefinition& fun)
+void FullInliner::updateCodeSize(FunctionDefinition const& _fun)
 {
-	m_functionSizes[fun.name] = CodeSize::codeSize(fun.body);
+	m_functionSizes[_fun.name] = CodeSize::codeSize(_fun.body);
 }
 
 void FullInliner::handleBlock(YulString _currentFunctionName, Block& _block)
@@ -100,8 +100,13 @@ bool FullInliner::shallInline(FunctionCall const& _funCall, YulString _callSite)
 	if (!calledFunction)
 		return false;
 
+	// Inline really, really tiny functions
+	size_t size = m_functionSizes.at(calledFunction->name);
+	if (size <= 1)
+		return true;
+
 	// Do not inline into already big functions.
-	if (m_functionSizes.at(_callSite) > 100)
+	if (m_functionSizes.at(_callSite) > 45)
 		return false;
 
 	if (m_singleUse.count(calledFunction->name))
@@ -119,8 +124,7 @@ bool FullInliner::shallInline(FunctionCall const& _funCall, YulString _callSite)
 			break;
 		}
 
-	size_t size = m_functionSizes.at(calledFunction->name);
-	return (size < 10 || (constantArg && size < 30));
+	return (size < 6 || (constantArg && size < 12));
 }
 
 void FullInliner::tentativelyUpdateCodeSize(YulString _function, YulString _callSite)
diff --git a/libyul/optimiser/FullInliner.h b/libyul/optimiser/FullInliner.h
index d2dd3229d..32664c963 100644
--- a/libyul/optimiser/FullInliner.h
+++ b/libyul/optimiser/FullInliner.h
@@ -91,7 +91,7 @@ public:
 	void tentativelyUpdateCodeSize(YulString _function, YulString _callSite);
 
 private:
-	void updateCodeSize(FunctionDefinition& fun);
+	void updateCodeSize(FunctionDefinition const& _fun);
 	void handleBlock(YulString _currentFunctionName, Block& _block);
 
 	/// The AST to be modified. The root block itself will not be modified, because