diff --git a/libchisel/src/remapimports.rs b/libchisel/src/remapimports.rs
index 8166a96..a67f506 100644
--- a/libchisel/src/remapimports.rs
+++ b/libchisel/src/remapimports.rs
@@ -41,7 +41,7 @@ impl<'a> ModuleConfig for RemapImports<'a> {
         if let Some(preset) = config.get("preset") {
             RemapImports::with_preset(preset)
         } else {
-            Err(ModuleError::NotSupported)
+            Err(ModuleError::MissingConfigKey("preset".to_string()))
         }
     }
 }
@@ -73,7 +73,7 @@ impl<'a> ModulePreset for RemapImports<'a> {
                     ImportList::with_preset("bignum")?,
                     Some("bignum_"),
                 )),
-                _ => return Err(ModuleError::NotSupported),
+                _ => return Err(ModuleError::InvalidConfigValue("preset".to_string(), preset_individual.to_string())),
             }
         }