diff --git a/crates/flux-fhir-analysis/locales/en-US.ftl b/crates/flux-fhir-analysis/locales/en-US.ftl
index efcbb5a39d..0f3b941bcc 100644
--- a/crates/flux-fhir-analysis/locales/en-US.ftl
+++ b/crates/flux-fhir-analysis/locales/en-US.ftl
@@ -228,7 +228,7 @@ fhir_analysis_generics_on_type_parameter =
     .label = found generics on sort type parameter
 
 fhir_analysis_generics_on_self_alias = 
-    type alias `Self` expect not generics but found {$found}
+    type alias Self expects no generics but found {$found}
     .label = found generics on type `Self`
 
 fhir_analysis_generics_on_opaque_sort = 
diff --git a/crates/flux-fhir-analysis/src/conv/mod.rs b/crates/flux-fhir-analysis/src/conv/mod.rs
index 45e2b8a99f..847b4e607d 100644
--- a/crates/flux-fhir-analysis/src/conv/mod.rs
+++ b/crates/flux-fhir-analysis/src/conv/mod.rs
@@ -1990,10 +1990,19 @@ fn conv_sort_path(
             }
             return Ok(rty::Sort::Param(def_id_to_param_ty(genv, def_id)));
         }
-        fhir::SortRes::SelfParam { .. } => return Ok(rty::Sort::Param(rty::SELF_PARAM_TY)),
+        fhir::SortRes::SelfParam { .. } => {
+            if !path.args.is_empty() {
+                let err = errors::GenericsOnSelf::new(
+                    path.segments.last().unwrap().span,
+                    path.args.len(),
+                );
+                return Err(genv.sess().emit_err(err))?;
+            }
+            return Ok(rty::Sort::Param(rty::SELF_PARAM_TY));
+        }
         fhir::SortRes::SelfAlias { alias_to } => {
             if !path.args.is_empty() {
-                let err = errors::GenericsOnSelfAlias::new(
+                let err = errors::GenericsOnSelf::new(
                     path.segments.last().unwrap().span,
                     path.args.len(),
                 );
@@ -2326,14 +2335,14 @@ mod errors {
 
     #[derive(Diagnostic)]
     #[diag(fhir_analysis_generics_on_type_parameter, code = E0999)]
-    pub(super) struct GenericsOnSelfAlias {
+    pub(super) struct GenericsOnSelf {
         #[primary_span]
         #[label]
         span: Span,
         found: usize,
     }
 
-    impl GenericsOnSelfAlias {
+    impl GenericsOnSelf {
         pub(super) fn new(span: Span, found: usize) -> Self {
             Self { span, found }
         }
diff --git a/tests/tests/neg/error_messages/conv/mismatched_generics.rs b/tests/tests/neg/error_messages/conv/mismatched_generics.rs
new file mode 100644
index 0000000000..9f64678bac
--- /dev/null
+++ b/tests/tests/neg/error_messages/conv/mismatched_generics.rs
@@ -0,0 +1,54 @@
+use flux_rs::*;
+
+#[refined_by(n: int)]
+struct S {
+    #[field(i32[n])]
+    f: i32,
+}
+
+defs! {
+    fn foo(s: S<int>) -> int { //~ Error sorts associated with this struct should have no generic arguments but 1 generic argument supplied
+        s.n
+    }
+
+    fn foo2(x: int<bool>) -> int { //~ Error primitive sort int expects no generics but found 1
+        1
+    }
+
+    fn foo3(x: Map<int>) -> int { //~ Error primitive sort Map expects exactly 2 generic arguments but found 1
+        1
+    } 
+
+    fn foo4(x: Map) -> int { //~ Error primitive sort Map expects exactly 2 generic arguments but found 0
+        1
+    }
+
+    fn foo5(x: Set<int, int>) -> int { //~ Error primitive sort Set expects exactly one generic argument but found 2
+        1
+    }
+
+    fn foo6(x: real<bool>) -> real { //~ Error primitive sort real expects no generics but found 1
+        1
+    }
+
+    fn foo7(x: bool<int>) -> real { //~ Error primitive sort bool expects no generics but found 1
+        1
+    }
+}
+
+#[flux::refined_by(f: T<int>)] //~ Error type parameter expects no generics but found 1
+struct X<T> { 
+    #[flux::field(T[f])]
+    f: T 
+}
+
+#[flux::assoc(fn foo(x: Self<int>) -> int)] //~ Error type parameter expects no generics but found 1 
+trait MyTrait {}
+
+flux_rs::defs! {
+    opaque sort MyOpaqueSort;
+}
+
+#[flux_rs::opaque]
+#[flux_rs::refined_by(f: MyOpaqueSort<int>)] //~ Error type parameter expects no generics but found 1
+struct Y {}