diff --git a/Box2D/Build/vs2015/imgui.vcxproj b/Box2D/Build/vs2015/imgui.vcxproj
index 28d62e0d0..5a91b89b9 100644
--- a/Box2D/Build/vs2015/imgui.vcxproj
+++ b/Box2D/Build/vs2015/imgui.vcxproj
@@ -104,6 +104,7 @@
       <WarningLevel>Level3</WarningLevel>
       <Optimization>Disabled</Optimization>
       <PreprocessorDefinitions>GLEW_STATIC;WIN32;_DEBUG;_LIB;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <AdditionalIncludeDirectories>../..</AdditionalIncludeDirectories>
     </ClCompile>
     <Link>
       <SubSystem>Windows</SubSystem>
@@ -133,6 +134,7 @@
       <FunctionLevelLinking>true</FunctionLevelLinking>
       <IntrinsicFunctions>true</IntrinsicFunctions>
       <PreprocessorDefinitions>GLEW_STATIC;WIN32;NDEBUG;_LIB;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <AdditionalIncludeDirectories>../..</AdditionalIncludeDirectories>
     </ClCompile>
     <Link>
       <SubSystem>Windows</SubSystem>