diff --git a/src/coreclr/gc/gcconfig.h b/src/coreclr/gc/gcconfig.h
index 886ea17743880d..3decd9e6e3936a 100644
--- a/src/coreclr/gc/gcconfig.h
+++ b/src/coreclr/gc/gcconfig.h
@@ -65,7 +65,7 @@ class GCConfigStringHolder
 #define GC_CONFIGURATION_KEYS \
     BOOL_CONFIG  (ServerGC,               "gcServer",               NULL,                             false,             "Whether we should be using Server GC")                                                   \
     BOOL_CONFIG  (ConcurrentGC,           "gcConcurrent",           NULL,                             true,              "Whether we should be using Concurrent GC")                                               \
-    BOOL_CONFIG  (ConservativeGC,         "gcConservative",         NULL,                             false,             "Enables/Disables conservative GC")                                                       \
+    BOOL_CONFIG  (ConservativeGC,         "gcConservative",         NULL,                             true,              "Enables/Disables conservative GC")                                                       \
     BOOL_CONFIG  (ForceCompact,           "gcForceCompact",         NULL,                             false,             "When set to true, always do compacting GC")                                              \
     BOOL_CONFIG  (RetainVM,               "GCRetainVM",             NULL,                             false,             "When set we put the segments that should be deleted on a standby list (instead of "      \
                                                                                                                          "releasing them back to the OS) which will be considered to satisfy new segment requests" \
diff --git a/src/coreclr/inc/clrconfigvalues.h b/src/coreclr/inc/clrconfigvalues.h
index a14ba1ec98da4b..57ca1305672deb 100644
--- a/src/coreclr/inc/clrconfigvalues.h
+++ b/src/coreclr/inc/clrconfigvalues.h
@@ -266,7 +266,7 @@ RETAIL_CONFIG_DWORD_INFO(UNSUPPORTED_GCBreakOnOOM, W("GCBreakOnOOM"), 0, "Does a
 RETAIL_CONFIG_DWORD_INFO(UNSUPPORTED_gcConcurrent, W("gcConcurrent"), (DWORD)-1, "Enables/Disables concurrent GC")
 
 #ifdef FEATURE_CONSERVATIVE_GC
-RETAIL_CONFIG_DWORD_INFO(UNSUPPORTED_gcConservative, W("gcConservative"), 0, "Enables/Disables conservative GC")
+RETAIL_CONFIG_DWORD_INFO(UNSUPPORTED_gcConservative, W("gcConservative"), 1, "Enables/Disables conservative GC")
 #endif
 RETAIL_CONFIG_DWORD_INFO(UNSUPPORTED_gcServer, W("gcServer"), 0, "Enables server GC")
 CONFIG_STRING_INFO(INTERNAL_GcCoverage, W("GcCoverage"), "Specify a method or regular expression of method names to run with GCStress")
diff --git a/src/libraries/Common/tests/TestUtilities/System/PlatformDetection.cs b/src/libraries/Common/tests/TestUtilities/System/PlatformDetection.cs
index b38d35ebc3440e..d89d687f2ebcbe 100644
--- a/src/libraries/Common/tests/TestUtilities/System/PlatformDetection.cs
+++ b/src/libraries/Common/tests/TestUtilities/System/PlatformDetection.cs
@@ -24,6 +24,7 @@ public static partial class PlatformDetection
 
         public static bool IsNetCore => Environment.Version.Major >= 5 || RuntimeInformation.FrameworkDescription.StartsWith(".NET Core", StringComparison.OrdinalIgnoreCase);
         public static bool IsMonoRuntime => Type.GetType("Mono.RuntimeStructs") != null;
+        public static bool IsUnity => true;
         public static bool IsNotMonoRuntime => !IsMonoRuntime;
         public static bool IsMonoInterpreter => GetIsRunningOnMonoInterpreter();
         public static bool IsMonoAOT => Environment.GetEnvironmentVariable("MONO_AOT_MODE") == "aot";
@@ -136,7 +137,7 @@ public static bool IsDrawingSupported
         // heavily on Reflection.Emit
         public static bool IsXmlDsigXsltTransformSupported => !PlatformDetection.IsInAppContainer && IsReflectionEmitSupported;
 
-        public static bool IsPreciseGcSupported => !IsMonoRuntime;
+        public static bool IsPreciseGcSupported => !IsMonoRuntime && !IsUnity;
 
         public static bool IsNotIntMaxValueArrayIndexSupported => s_largeArrayIsNotSupported.Value;