diff --git a/build/zlib.vcxproj b/build/zlib.vcxproj
index 86bd959..4d7cd55 100644
--- a/build/zlib.vcxproj
+++ b/build/zlib.vcxproj
@@ -258,6 +258,7 @@
       <ControlFlowGuard>Guard</ControlFlowGuard>
       <AdditionalOptions>/Zi /Gy %(AdditionalOptions)</AdditionalOptions>
       <ProgramDataBaseFileName>$(OutDir)</ProgramDataBaseFileName>
+      <WholeProgramOptimization>false</WholeProgramOptimization>
     </ClCompile>
     <Lib>
       <SubSystem>Console</SubSystem>
@@ -278,6 +279,7 @@
       <ControlFlowGuard>Guard</ControlFlowGuard>
       <AdditionalOptions>/Zi /Gy %(AdditionalOptions)</AdditionalOptions>
       <ProgramDataBaseFileName>$(OutDir)</ProgramDataBaseFileName>
+      <WholeProgramOptimization>false</WholeProgramOptimization>
     </ClCompile>
     <Lib>
       <SubSystem>Console</SubSystem>
@@ -298,6 +300,7 @@
       <ControlFlowGuard>Guard</ControlFlowGuard>
       <AdditionalOptions>/Zi /Gy %(AdditionalOptions)</AdditionalOptions>
       <ProgramDataBaseFileName>$(OutDir)</ProgramDataBaseFileName>
+      <WholeProgramOptimization>false</WholeProgramOptimization>
     </ClCompile>
     <Lib>
       <SubSystem>Console</SubSystem>
@@ -318,6 +321,7 @@
       <ControlFlowGuard>Guard</ControlFlowGuard>
       <AdditionalOptions>/Zi /Gy %(AdditionalOptions)</AdditionalOptions>
       <ProgramDataBaseFileName>$(OutDir)</ProgramDataBaseFileName>
+      <WholeProgramOptimization>false</WholeProgramOptimization>
     </ClCompile>
     <Lib>
       <SubSystem>Console</SubSystem>