diff --git a/src/Compiler/AbstractIL/il.fs b/src/Compiler/AbstractIL/il.fs
index 9ed1822676b..2aadea335e1 100644
--- a/src/Compiler/AbstractIL/il.fs
+++ b/src/Compiler/AbstractIL/il.fs
@@ -5690,6 +5690,7 @@ let resolveILMethodRefWithRescope r (td: ILTypeDef) (mref: ILMethodRef) =
             mref.CallingConv = md.CallingConv
             && (md.Parameters, argTypes)
                ||> List.lengthsEqAndForall2 (fun p1 p2 -> r p1.Type = p2)
+            && md.GenericParams.Length = mref.GenericArity
             &&
             // REVIEW: this uses equality on ILType. For CMOD_OPTIONAL this is not going to be correct
             r md.Return.Type = retType)
diff --git a/tests/FSharp.Compiler.Private.Scripting.UnitTests/FSharpScriptTests.fs b/tests/FSharp.Compiler.Private.Scripting.UnitTests/FSharpScriptTests.fs
index 50c354da629..a8739d93390 100644
--- a/tests/FSharp.Compiler.Private.Scripting.UnitTests/FSharpScriptTests.fs
+++ b/tests/FSharp.Compiler.Private.Scripting.UnitTests/FSharpScriptTests.fs
@@ -486,3 +486,17 @@ test pfloat "1.234"
         let opt = script.Eval(code)  |> getValue
         let value = opt.Value
         Assert.True(true = downcast value.ReflectionValue)
+
+    [<Fact>]
+    member _.``Nuget package with method duplicates differing only in generic arity``() =
+        // regression test for: https://github.com/dotnet/fsharp/issues/17796
+        // Was an internal error
+        let code = """
+#r "nuget: Microsoft.Extensions.DependencyInjection.Abstractions"
+open Microsoft.Extensions.DependencyInjection
+let add (col:IServiceCollection) = 
+    col.AddSingleton<string,string>()
+"""
+        use script = new FSharpScript(additionalArgs=[| |])
+        let _value,diag = script.Eval(code)
+        Assert.Empty(diag)