diff --git a/Project.toml b/Project.toml
index c297f7e..766a183 100644
--- a/Project.toml
+++ b/Project.toml
@@ -1,6 +1,6 @@
 name = "GraphDynamics"
 uuid = "bcd5d0fe-e6b7-4ef1-9848-780c183c7f4c"
-version = "0.2.4"
+version = "0.2.5"
 
 [deps]
 Accessors = "7d9f7c33-5ae7-4f3b-8dc6-eff91059b697"
diff --git a/src/symbolic_indexing.jl b/src/symbolic_indexing.jl
index 0e245a7..fea4929 100644
--- a/src/symbolic_indexing.jl
+++ b/src/symbolic_indexing.jl
@@ -125,7 +125,7 @@ function SymbolicIndexingInterface.parameter_values(p::GraphSystemParameters, i:
 end
 
 function SymbolicIndexingInterface.parameter_symbols(g::GraphSystem)
-    collect(keys(f.param_namemap))
+    collect(keys(g.param_namemap))
 end
 
 function SymbolicIndexingInterface.is_independent_variable(sys::GraphSystem, sym)