diff --git a/src/tests/JIT/HardwareIntrinsics/General/Vector256_1/Vector256_1_r.csproj b/src/tests/JIT/HardwareIntrinsics/General/Vector256_1/Vector256_1_r.csproj
index 2e1ffa2dcc1c7d..6eedfbbafd0f18 100644
--- a/src/tests/JIT/HardwareIntrinsics/General/Vector256_1/Vector256_1_r.csproj
+++ b/src/tests/JIT/HardwareIntrinsics/General/Vector256_1/Vector256_1_r.csproj
@@ -2,6 +2,8 @@
   <PropertyGroup>
     <OutputType>Exe</OutputType>
     <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
+    <!-- Disabled under GCStress due to https://github.com/dotnet/runtime/issues/39581 -->
+    <GCStressIncompatible>true</GCStressIncompatible>
   </PropertyGroup>
   <PropertyGroup>
     <DebugType>Embedded</DebugType>
diff --git a/src/tests/JIT/HardwareIntrinsics/General/Vector256_1/Vector256_1_ro.csproj b/src/tests/JIT/HardwareIntrinsics/General/Vector256_1/Vector256_1_ro.csproj
index 91f1f64aec297a..ea939ebef62106 100644
--- a/src/tests/JIT/HardwareIntrinsics/General/Vector256_1/Vector256_1_ro.csproj
+++ b/src/tests/JIT/HardwareIntrinsics/General/Vector256_1/Vector256_1_ro.csproj
@@ -2,6 +2,8 @@
   <PropertyGroup>
     <OutputType>Exe</OutputType>
     <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
+    <!-- Disabled under GCStress due to https://github.com/dotnet/runtime/issues/39581 -->
+    <GCStressIncompatible>true</GCStressIncompatible>
   </PropertyGroup>
   <PropertyGroup>
     <DebugType>Embedded</DebugType>