diff --git a/ssc/ast/nodes.variables.cs b/ssc/ast/nodes.variables.cs
index 3c0596d..88043fd 100644
--- a/ssc/ast/nodes.variables.cs
+++ b/ssc/ast/nodes.variables.cs
@@ -35,7 +35,7 @@
 			var symbol = compiler.Context.DeclareVariable(this);
 			symbol.Modifiers = Modifiers;
 			if ((Modifiers & sunSymbolModifiers.Constant) != 0) {
-				throw new sunInvalidModifierException(this[0]);
+				throw new sunConstantDeclarationException(this);
 			}
 		}
 	}
diff --git a/ssc/exceptions.cs b/ssc/exceptions.cs
index 26b004e..27298df 100644
--- a/ssc/exceptions.cs
+++ b/ssc/exceptions.cs
@@ -259,4 +259,12 @@ namespace arookas {
 		public sunInvalidModifierException(sunNode node)
 			: base(node) { }
 	}
+	class sunConstantDeclarationException : sunNodeException<sunVariableDeclaration> {
+		public override string Message {
+			get { return "Constant variables must be assigned a value."; }
+		}
+
+		public sunConstantDeclarationException(sunVariableDeclaration node)
+			: base(node) { }
+	}
 }