diff --git a/thirdparty/libsquish/libsquish.vcxproj b/thirdparty/libsquish/libsquish.vcxproj
index ad5528d0..6cbb1acd 100644
--- a/thirdparty/libsquish/libsquish.vcxproj
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@@ -138,7 +138,6 @@
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       <Optimization>Disabled</Optimization>
       <SDLCheck>true</SDLCheck>
@@ -175,7 +174,6 @@
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   <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'">
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-      <PrecompiledHeader>Use</PrecompiledHeader>
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       <Optimization>MaxSpeed</Optimization>
       <FunctionLevelLinking>true</FunctionLevelLinking>
diff --git a/thirdparty/libtomcrypt/libtomcrypt.vcxproj b/thirdparty/libtomcrypt/libtomcrypt.vcxproj
index 8d56c25e..2ff5d4aa 100644
--- a/thirdparty/libtomcrypt/libtomcrypt.vcxproj
+++ b/thirdparty/libtomcrypt/libtomcrypt.vcxproj
@@ -538,12 +538,12 @@
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       <Optimization>Disabled</Optimization>
       <SDLCheck>true</SDLCheck>
-      <PreprocessorDefinitions>_DEBUG;_LIB;%(PreprocessorDefinitions)</PreprocessorDefinitions>
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       <ConformanceMode>true</ConformanceMode>
+      <AdditionalIncludeDirectories>$(ProjectDir)headers;$(SolutionDir)thirdparty\libtommath;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
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     <Link>
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@@ -576,14 +576,14 @@
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       <IntrinsicFunctions>true</IntrinsicFunctions>
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       <ConformanceMode>true</ConformanceMode>
+      <AdditionalIncludeDirectories>$(ProjectDir)headers;$(SolutionDir)thirdparty\libtommath;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
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     <Link>
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diff --git a/thirdparty/libtommath/libtommath.vcxproj b/thirdparty/libtommath/libtommath.vcxproj
index 9dd171b2..7a3885aa 100644
--- a/thirdparty/libtommath/libtommath.vcxproj
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       <SDLCheck>true</SDLCheck>
       <PreprocessorDefinitions>_DEBUG;_LIB;%(PreprocessorDefinitions)</PreprocessorDefinitions>
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+      <AdditionalIncludeDirectories>$(ProjectDir);%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
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@@ -294,7 +294,6 @@
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@@ -302,6 +301,7 @@
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       <PreprocessorDefinitions>NDEBUG;_LIB;%(PreprocessorDefinitions)</PreprocessorDefinitions>
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diff --git a/thirdparty/minilzo/minilzo.vcxproj b/thirdparty/minilzo/minilzo.vcxproj
index c9922227..4c4527cb 100644
--- a/thirdparty/minilzo/minilzo.vcxproj
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@@ -116,7 +116,6 @@
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@@ -153,7 +152,6 @@
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diff --git a/thirdparty/minizip/minizip.vcxproj b/thirdparty/minizip/minizip.vcxproj
index b499c3fd..65bde8cc 100644
--- a/thirdparty/minizip/minizip.vcxproj
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       <SDLCheck>true</SDLCheck>
-      <PreprocessorDefinitions>_DEBUG;_LIB;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <PreprocessorDefinitions>_CRT_SECURE_NO_WARNINGS;_DEBUG;_LIB;%(PreprocessorDefinitions)</PreprocessorDefinitions>
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@@ -156,14 +156,14 @@
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-      <PreprocessorDefinitions>NDEBUG;_LIB;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <PreprocessorDefinitions>_CRT_SECURE_NO_WARNINGS;NDEBUG;_LIB;%(PreprocessorDefinitions)</PreprocessorDefinitions>
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diff --git a/thirdparty/zlib/zlib.vcxproj b/thirdparty/zlib/zlib.vcxproj
index 6652d684..e9f318ab 100644
--- a/thirdparty/zlib/zlib.vcxproj
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       <SDLCheck>true</SDLCheck>
-      <PreprocessorDefinitions>_DEBUG;_LIB;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <PreprocessorDefinitions>_CRT_SECURE_NO_WARNINGS;_CRT_NONSTDC_NO_DEPRECATE;_DEBUG;_LIB;%(PreprocessorDefinitions)</PreprocessorDefinitions>
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