diff --git a/src/Lexilla.vcxproj b/src/Lexilla.vcxproj
index 82aa9b7..6b6f340 100644
--- a/src/Lexilla.vcxproj
+++ b/src/Lexilla.vcxproj
@@ -95,6 +95,7 @@
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@@ -103,6 +104,7 @@
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     <ClCompile>
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+      <RuntimeLibrary>MultiThreadedDebug</RuntimeLibrary>
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@@ -111,6 +113,7 @@
   <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Debug|ARM64'">
     <ClCompile>
       <PreprocessorDefinitions>_DEBUG;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <RuntimeLibrary>MultiThreadedDebug</RuntimeLibrary>
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     <Link>
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@@ -122,6 +125,7 @@
       <FunctionLevelLinking>true</FunctionLevelLinking>
       <IntrinsicFunctions>true</IntrinsicFunctions>
       <PreprocessorDefinitions>NDEBUG;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <RuntimeLibrary>MultiThreaded</RuntimeLibrary>
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@@ -133,6 +137,7 @@
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       <IntrinsicFunctions>true</IntrinsicFunctions>
       <PreprocessorDefinitions>NDEBUG;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <RuntimeLibrary>MultiThreaded</RuntimeLibrary>
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@@ -144,6 +149,7 @@
       <FunctionLevelLinking>true</FunctionLevelLinking>
       <IntrinsicFunctions>true</IntrinsicFunctions>
       <PreprocessorDefinitions>NDEBUG;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <RuntimeLibrary>MultiThreaded</RuntimeLibrary>
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     <Link>
       <EnableCOMDATFolding>true</EnableCOMDATFolding>