diff --git a/blocks/cflow/MethodCallInlinerBase.cs b/blocks/cflow/MethodCallInlinerBase.cs
index 970d87b1..47701e7d 100644
--- a/blocks/cflow/MethodCallInlinerBase.cs
+++ b/blocks/cflow/MethodCallInlinerBase.cs
@@ -229,7 +229,12 @@ namespace de4dot.blocks.cflow {
 		}
 
 		protected static bool isValueType(IType type) {
-			return type != null && type.IsValueType;
+			if (type == null)
+				return false;
+			var ts = type as TypeSig;
+			if (ts == null)
+				return type.IsValueType;
+			return ts.IsValueType && ts.ElementType != ElementType.Void;
 		}
 	}
 }
diff --git a/de4dot.code/deobfuscators/Babel_NET/BabelMethodCallInliner.cs b/de4dot.code/deobfuscators/Babel_NET/BabelMethodCallInliner.cs
index c6755377..bd629313 100644
--- a/de4dot.code/deobfuscators/Babel_NET/BabelMethodCallInliner.cs
+++ b/de4dot.code/deobfuscators/Babel_NET/BabelMethodCallInliner.cs
@@ -236,7 +236,7 @@ namespace de4dot.code.deobfuscators.Babel_NET {
 		protected override bool isCompatibleType(int paramIndex, IType origType, IType newType) {
 			if (new SigComparer().Equals(origType, newType))
 				return true;
-			if (newType.IsValueType || origType.IsValueType)
+			if (isValueType(newType) || isValueType(origType))
 				return false;
 			return newType.FullName == "System.Object";
 		}