diff --git a/projects/vs2017/hl_cdll.vcxproj b/projects/vs2017/hl_cdll.vcxproj
index 2dcec04b4..71e0c90d4 100644
--- a/projects/vs2017/hl_cdll.vcxproj
+++ b/projects/vs2017/hl_cdll.vcxproj
@@ -64,6 +64,7 @@
       <RuntimeTypeInfo>true</RuntimeTypeInfo>
       <AdditionalOptions>/Zc:threadSafeInit- %(AdditionalOptions)</AdditionalOptions>
       <MultiProcessorCompilation>true</MultiProcessorCompilation>
+      <LanguageStandard>stdcpp17</LanguageStandard>
     </ClCompile>
     <Link>
       <SubSystem>Windows</SubSystem>
@@ -92,6 +93,7 @@
       <RuntimeTypeInfo>true</RuntimeTypeInfo>
       <AdditionalOptions>/Zc:threadSafeInit- %(AdditionalOptions)</AdditionalOptions>
       <MultiProcessorCompilation>true</MultiProcessorCompilation>
+      <LanguageStandard>stdcpp17</LanguageStandard>
     </ClCompile>
     <Link>
       <SubSystem>Windows</SubSystem>
diff --git a/projects/vs2017/hldll.vcxproj b/projects/vs2017/hldll.vcxproj
index 31493e69a..2d71cb432 100644
--- a/projects/vs2017/hldll.vcxproj
+++ b/projects/vs2017/hldll.vcxproj
@@ -64,6 +64,7 @@
       <RuntimeLibrary>MultiThreadedDebug</RuntimeLibrary>
       <AdditionalOptions>/Zc:threadSafeInit- %(AdditionalOptions)</AdditionalOptions>
       <MultiProcessorCompilation>true</MultiProcessorCompilation>
+      <LanguageStandard>stdcpp17</LanguageStandard>
     </ClCompile>
     <Link>
       <SubSystem>Windows</SubSystem>
@@ -90,6 +91,7 @@
       <RuntimeTypeInfo>true</RuntimeTypeInfo>
       <AdditionalOptions>/Zc:threadSafeInit- %(AdditionalOptions)</AdditionalOptions>
       <MultiProcessorCompilation>true</MultiProcessorCompilation>
+      <LanguageStandard>stdcpp17</LanguageStandard>
     </ClCompile>
     <Link>
       <SubSystem>Windows</SubSystem>
diff --git a/projects/vs2019/hl_cdll.vcxproj b/projects/vs2019/hl_cdll.vcxproj
index bff2060fc..fc366bcca 100644
--- a/projects/vs2019/hl_cdll.vcxproj
+++ b/projects/vs2019/hl_cdll.vcxproj
@@ -66,6 +66,7 @@
       <RuntimeTypeInfo>true</RuntimeTypeInfo>
       <AdditionalOptions>/Zc:threadSafeInit- %(AdditionalOptions)</AdditionalOptions>
       <MultiProcessorCompilation>true</MultiProcessorCompilation>
+      <LanguageStandard>stdcpp17</LanguageStandard>
     </ClCompile>
     <Link>
       <SubSystem>Windows</SubSystem>
@@ -94,6 +95,7 @@
       <RuntimeTypeInfo>true</RuntimeTypeInfo>
       <AdditionalOptions>/Zc:threadSafeInit- %(AdditionalOptions)</AdditionalOptions>
       <MultiProcessorCompilation>true</MultiProcessorCompilation>
+      <LanguageStandard>stdcpp17</LanguageStandard>
     </ClCompile>
     <Link>
       <SubSystem>Windows</SubSystem>
diff --git a/projects/vs2019/hldll.vcxproj b/projects/vs2019/hldll.vcxproj
index 320606fbe..ace3dc5fd 100644
--- a/projects/vs2019/hldll.vcxproj
+++ b/projects/vs2019/hldll.vcxproj
@@ -66,6 +66,7 @@
       <RuntimeLibrary>MultiThreadedDebug</RuntimeLibrary>
       <AdditionalOptions>/Zc:threadSafeInit- %(AdditionalOptions)</AdditionalOptions>
       <MultiProcessorCompilation>true</MultiProcessorCompilation>
+      <LanguageStandard>stdcpp17</LanguageStandard>
     </ClCompile>
     <Link>
       <SubSystem>Windows</SubSystem>
@@ -92,6 +93,7 @@
       <RuntimeTypeInfo>true</RuntimeTypeInfo>
       <AdditionalOptions>/Zc:threadSafeInit- %(AdditionalOptions)</AdditionalOptions>
       <MultiProcessorCompilation>true</MultiProcessorCompilation>
+      <LanguageStandard>stdcpp17</LanguageStandard>
     </ClCompile>
     <Link>
       <SubSystem>Windows</SubSystem>