diff --git a/doc/langref.md b/doc/langref.md
index 283ca9d91450ab725efba883dd0f04faaf54f8a2..097f1b650c5c3a73ae638241e1efa392a6551d0e 100644
--- a/doc/langref.md
+++ b/doc/langref.md
@@ -616,3 +616,7 @@ or `switch` with compile time constants, and inline functions.
 ### @intType(inline is_signed: bool, inline bit_count: u8) -> type
 
 This function returns an integer type with the given signness and bit count.
+
+### @setFnTest(func)
+
+Makes the target function a test function.
diff --git a/src/all_types.hpp b/src/all_types.hpp
index 1fd22d650beb951f95fbaa62c401ab593f69ff9e..cfc35dd6dbfd9be1c0e4449d99dba534d14092d9 100644
--- a/src/all_types.hpp
+++ b/src/all_types.hpp
@@ -987,7 +987,6 @@ struct FnTableEntry {
 
     AstNode *fn_no_inline_set_node;
     AstNode *fn_export_set_node;
-    AstNode *fn_test_set_node;
     AstNode *fn_static_eval_set_node;
 
     ZigList<IrInstruction *> alloca_list;
@@ -1674,7 +1673,6 @@ struct IrInstructionSetFnTest {
     IrInstruction base;
 
     IrInstruction *fn_value;
-    IrInstruction *is_test;
 };
 
 struct IrInstructionSetFnVisible {
diff --git a/src/codegen.cpp b/src/codegen.cpp
index 8106b9f33aa37204997f1299c0651aff8f22a200..00f81a3bf70000eac8e73c3721e714b5fe700f50 100644
--- a/src/codegen.cpp
+++ b/src/codegen.cpp
@@ -3083,7 +3083,7 @@ static void define_builtin_fns(CodeGen *g) {
     create_builtin_fn_with_arg_count(g, BuiltinFnIdCompileErr, "compileError", 1);
     create_builtin_fn_with_arg_count(g, BuiltinFnIdIntType, "intType", 2);
     create_builtin_fn_with_arg_count(g, BuiltinFnIdUnreachable, "unreachable", 0);
-    create_builtin_fn_with_arg_count(g, BuiltinFnIdSetFnTest, "setFnTest", 2);
+    create_builtin_fn_with_arg_count(g, BuiltinFnIdSetFnTest, "setFnTest", 1);
     create_builtin_fn_with_arg_count(g, BuiltinFnIdSetFnVisible, "setFnVisible", 2);
     create_builtin_fn_with_arg_count(g, BuiltinFnIdSetFnNoInline, "setFnNoInline", 2);
     create_builtin_fn_with_arg_count(g, BuiltinFnIdSetDebugSafety, "setDebugSafety", 2);
diff --git a/src/ir.cpp b/src/ir.cpp
index 9bde6c149a9166b21f46c35bbbec91f8cb6b1bdd..5869d2d3e10b08a93e3ca230722b8ea9d21435a9 100644
--- a/src/ir.cpp
+++ b/src/ir.cpp
@@ -934,15 +934,13 @@ static IrInstruction *ir_build_ptr_type_child(IrBuilder *irb, Scope *scope, AstN
     return &instruction->base;
 }
 
-static IrInstruction *ir_build_set_fn_test(IrBuilder *irb, Scope *scope, AstNode *source_node, IrInstruction *fn_value,
-        IrInstruction *is_test)
+static IrInstruction *ir_build_set_fn_test(IrBuilder *irb, Scope *scope, AstNode *source_node,
+        IrInstruction *fn_value)
 {
     IrInstructionSetFnTest *instruction = ir_build_instruction<IrInstructionSetFnTest>(irb, scope, source_node);
     instruction->fn_value = fn_value;
-    instruction->is_test = is_test;
 
     ir_ref_instruction(fn_value);
-    ir_ref_instruction(is_test);
 
     return &instruction->base;
 }
@@ -1786,12 +1784,7 @@ static IrInstruction *ir_gen_builtin_fn_call(IrBuilder *irb, Scope *scope, AstNo
                 if (arg0_value == irb->codegen->invalid_instruction)
                     return arg0_value;
 
-                AstNode *arg1_node = node->data.fn_call_expr.params.at(1);
-                IrInstruction *arg1_value = ir_gen_node(irb, arg1_node, scope);
-                if (arg1_value == irb->codegen->invalid_instruction)
-                    return arg1_value;
-
-                return ir_build_set_fn_test(irb, scope, node, arg0_value, arg1_value);
+                return ir_build_set_fn_test(irb, scope, node, arg0_value);
             }
         case BuiltinFnIdSetFnVisible:
             {
@@ -5680,26 +5673,15 @@ static TypeTableEntry *ir_analyze_instruction_set_fn_test(IrAnalyze *ira,
         IrInstructionSetFnTest *set_fn_test_instruction)
 {
     IrInstruction *fn_value = set_fn_test_instruction->fn_value->other;
-    IrInstruction *is_test_value = set_fn_test_instruction->is_test->other;
 
     FnTableEntry *fn_entry = ir_resolve_fn(ira, fn_value);
     if (!fn_entry)
         return ira->codegen->builtin_types.entry_invalid;
 
-    if (!ir_resolve_bool(ira, is_test_value, &fn_entry->is_test))
-        return ira->codegen->builtin_types.entry_invalid;
-
-    AstNode *source_node = set_fn_test_instruction->base.source_node;
-    if (fn_entry->fn_test_set_node) {
-        ErrorMsg *msg = add_node_error(ira->codegen, source_node,
-                buf_sprintf("function test attribute set twice"));
-        add_error_note(ira->codegen, msg, fn_entry->fn_test_set_node, buf_sprintf("first set here"));
-        return ira->codegen->builtin_types.entry_invalid;
-    }
-    fn_entry->fn_test_set_node = source_node;
-
-    if (fn_entry->is_test)
+    if (!fn_entry->is_test) {
+        fn_entry->is_test = true;
         ira->codegen->test_fn_count += 1;
+    }
 
     ir_build_const_from(ira, &set_fn_test_instruction->base, false);
     return ira->codegen->builtin_types.entry_void;
diff --git a/src/ir_print.cpp b/src/ir_print.cpp
index 7f27ab104b83e7cc72ecf66dde4b8309ea7cae43..16a0ae3c786e67cea8aecdde059685095ae454cb 100644
--- a/src/ir_print.cpp
+++ b/src/ir_print.cpp
@@ -491,8 +491,6 @@ static void ir_print_enum_field_ptr(IrPrint *irp, IrInstructionEnumFieldPtr *ins
 static void ir_print_set_fn_test(IrPrint *irp, IrInstructionSetFnTest *instruction) {
     fprintf(irp->f, "@setFnTest(");
     ir_print_other_instruction(irp, instruction->fn_value);
-    fprintf(irp->f, ", ");
-    ir_print_other_instruction(irp, instruction->is_test);
     fprintf(irp->f, ")");
 }