diff --git a/BizHawk.Emulation/BizHawk.Emulation.csproj b/BizHawk.Emulation/BizHawk.Emulation.csproj
index 27650cbee4..a3e5a58ef3 100644
--- a/BizHawk.Emulation/BizHawk.Emulation.csproj
+++ b/BizHawk.Emulation/BizHawk.Emulation.csproj
@@ -50,7 +50,7 @@
     <DebugType>pdbonly</DebugType>
     <Optimize>true</Optimize>
     <OutputPath>bin\Release\</OutputPath>
-    <DefineConstants>TRACE</DefineConstants>
+    <DefineConstants>TRACE;VS2010</DefineConstants>
     <ErrorReport>prompt</ErrorReport>
     <WarningLevel>4</WarningLevel>
     <PlatformTarget>x86</PlatformTarget>
diff --git a/BizHawk.Emulation/BizHawk.Emulation_v4.5.csproj b/BizHawk.Emulation/BizHawk.Emulation_v4.5.csproj
index b738a00be0..f75e5d963e 100644
--- a/BizHawk.Emulation/BizHawk.Emulation_v4.5.csproj
+++ b/BizHawk.Emulation/BizHawk.Emulation_v4.5.csproj
@@ -51,7 +51,7 @@
     <DebugType>pdbonly</DebugType>
     <Optimize>true</Optimize>
     <OutputPath>bin\Release\</OutputPath>
-    <DefineConstants>TRACE</DefineConstants>
+    <DefineConstants>TRACE;VS2012</DefineConstants>
     <ErrorReport>prompt</ErrorReport>
     <WarningLevel>4</WarningLevel>
     <PlatformTarget>x86</PlatformTarget>
diff --git a/BizHawk.Emulation/Consoles/Nintendo/NES/Core.cs b/BizHawk.Emulation/Consoles/Nintendo/NES/Core.cs
index dc00ed397c..5a4cb02aba 100644
--- a/BizHawk.Emulation/Consoles/Nintendo/NES/Core.cs
+++ b/BizHawk.Emulation/Consoles/Nintendo/NES/Core.cs
@@ -301,7 +301,9 @@ namespace BizHawk.Emulation.Consoles.Nintendo
 		static ByteBuffer cpu_sequence_PAL = new ByteBuffer(new byte[]{4,3,3,3,3,4,3,3,3,3,4,3,3,3,3,4,3,3,3,3,4,3,3,3,3,4,3,3,3,3,4,3,3,3,3,4,3,3,3,3});
 		public int cpu_step, cpu_stepcounter, cpu_deadcounter;
 
+#if VS2012
 		[MethodImpl(MethodImplOptions.AggressiveInlining)]
+#endif
 		protected void RunCpuOne()
 		{
 			cpu_stepcounter++;
@@ -336,7 +338,9 @@ namespace BizHawk.Emulation.Consoles.Nintendo
 			}
 		}
 
+#if VS2012
 		[MethodImpl(MethodImplOptions.AggressiveInlining)]
+#endif
 		public byte ReadReg(int addr)
 		{
 			switch (addr)
diff --git a/BizHawk.Emulation/Consoles/Nintendo/NES/PPU.cs b/BizHawk.Emulation/Consoles/Nintendo/NES/PPU.cs
index dfc7c30380..454be4bf78 100644
--- a/BizHawk.Emulation/Consoles/Nintendo/NES/PPU.cs
+++ b/BizHawk.Emulation/Consoles/Nintendo/NES/PPU.cs
@@ -144,7 +144,9 @@ namespace BizHawk.Emulation.Consoles.Nintendo
 				idleSynch = true;
 			}
 
+#if VS2012
 			[MethodImpl(MethodImplOptions.AggressiveInlining)]
+#endif
 			void TriggerNMI()
 			{
 				nes.cpu.NMI = true;
@@ -165,7 +167,9 @@ namespace BizHawk.Emulation.Consoles.Nintendo
 				}
 			}
 
+#if VS2012
 			[MethodImpl(MethodImplOptions.AggressiveInlining)]
+#endif
 			void runppu(int x)
 			{
 				//run one ppu cycle at a time so we can interact with the ppu and clockPPU at high granularity