diff --git a/silk/fixed/silk_fixed.vcxproj b/silk/fixed/silk_fixed.vcxproj
index 55c76c2470c7f87b620756d45986ae0e5178dc66..5c94b30c33f2581a87fb700efe069ada583689a1 100644
--- a/silk/fixed/silk_fixed.vcxproj
+++ b/silk/fixed/silk_fixed.vcxproj
@@ -75,6 +75,7 @@
       <Optimization>Disabled</Optimization>
       <PreprocessorDefinitions>HAVE_CONFIG_H;WIN32;_DEBUG;_LIB;%(PreprocessorDefinitions)</PreprocessorDefinitions>
       <AdditionalIncludeDirectories>../;../../win32;../../celt;../../include</AdditionalIncludeDirectories>
+      <RuntimeLibrary>MultiThreadedDebug</RuntimeLibrary>
     </ClCompile>
     <Link>
       <SubSystem>Windows</SubSystem>
@@ -92,6 +93,7 @@
       <Optimization>Disabled</Optimization>
       <PreprocessorDefinitions>HAVE_CONFIG_H;WIN32;_DEBUG;_LIB;%(PreprocessorDefinitions)</PreprocessorDefinitions>
       <AdditionalIncludeDirectories>../;../../win32;../../celt;../../include</AdditionalIncludeDirectories>
+      <RuntimeLibrary>MultiThreadedDebug</RuntimeLibrary>
     </ClCompile>
     <Link>
       <SubSystem>Windows</SubSystem>
@@ -132,6 +134,7 @@
       <IntrinsicFunctions>true</IntrinsicFunctions>
       <PreprocessorDefinitions>HAVE_CONFIG_H;WIN32;NDEBUG;_LIB;%(PreprocessorDefinitions)</PreprocessorDefinitions>
       <AdditionalIncludeDirectories>../;../../win32;../../celt;../../include</AdditionalIncludeDirectories>
+      <RuntimeLibrary>MultiThreaded</RuntimeLibrary>
     </ClCompile>
     <Link>
       <SubSystem>Windows</SubSystem>
diff --git a/src/opus_demo.vcxproj b/src/opus_demo.vcxproj
index 4bbea68aaa17cc258352690a0910930e69985b1a..02a4a31f52385bc4a7904ace3dfa26e37da528ef 100644
--- a/src/opus_demo.vcxproj
+++ b/src/opus_demo.vcxproj
@@ -73,6 +73,7 @@
       <Optimization>Disabled</Optimization>
       <PreprocessorDefinitions>HAVE_CONFIG_H;WIN32;_DEBUG;_CONSOLE;%(PreprocessorDefinitions)</PreprocessorDefinitions>
       <AdditionalIncludeDirectories>../silk;../celt;../win32;../include;</AdditionalIncludeDirectories>
+      <RuntimeLibrary>MultiThreadedDebug</RuntimeLibrary>
     </ClCompile>
     <Link>
       <SubSystem>Console</SubSystem>
diff --git a/tests/test_opus_api.vcxproj b/tests/test_opus_api.vcxproj
index 30ced576e3f13350c7076af08cd8a28b5466f350..ca4bcc78715a96754e8aec8f31da0c48999468b8 100644
--- a/tests/test_opus_api.vcxproj
+++ b/tests/test_opus_api.vcxproj
@@ -54,6 +54,7 @@
       <Optimization>Disabled</Optimization>
       <PreprocessorDefinitions>HAVE_CONFIG_H;WIN32;_DEBUG;_CONSOLE;%(PreprocessorDefinitions)</PreprocessorDefinitions>
       <AdditionalIncludeDirectories>../silk;../celt;../win32;../include;</AdditionalIncludeDirectories>
+      <RuntimeLibrary>MultiThreadedDebug</RuntimeLibrary>
     </ClCompile>
     <Link>
       <SubSystem>Console</SubSystem>
diff --git a/tests/test_opus_decode.vcxproj b/tests/test_opus_decode.vcxproj
index 495f55642a47b8110ad5248b5645de1f26898cc6..6c8445034a5b24cea9d20c42c4be7e36ed048628 100644
--- a/tests/test_opus_decode.vcxproj
+++ b/tests/test_opus_decode.vcxproj
@@ -54,6 +54,7 @@
       <Optimization>Disabled</Optimization>
       <PreprocessorDefinitions>HAVE_CONFIG_H;WIN32;_DEBUG;_CONSOLE;%(PreprocessorDefinitions)</PreprocessorDefinitions>
       <AdditionalIncludeDirectories>../silk;../celt;../win32;../include;</AdditionalIncludeDirectories>
+      <RuntimeLibrary>MultiThreadedDebug</RuntimeLibrary>
     </ClCompile>
     <Link>
       <SubSystem>Console</SubSystem>
diff --git a/tests/test_opus_encode.vcxproj b/tests/test_opus_encode.vcxproj
index 7ed3ac7a07a3ee4a1dc774919d92f28e24387355..b3114a6a103eb9078147932ab9a185813094e5f8 100644
--- a/tests/test_opus_encode.vcxproj
+++ b/tests/test_opus_encode.vcxproj
@@ -54,6 +54,7 @@
       <Optimization>Disabled</Optimization>
       <PreprocessorDefinitions>HAVE_CONFIG_H;WIN32;_DEBUG;_CONSOLE;%(PreprocessorDefinitions)</PreprocessorDefinitions>
       <AdditionalIncludeDirectories>../silk;../celt;../win32;../include;</AdditionalIncludeDirectories>
+      <RuntimeLibrary>MultiThreadedDebug</RuntimeLibrary>
     </ClCompile>
     <Link>
       <SubSystem>Console</SubSystem>