diff --git a/silk/fixed/silk_fixed.vcxproj b/silk/fixed/silk_fixed.vcxproj
index 55c76c24..5c94b30c 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 4bbea68a..02a4a31f 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 30ced576..ca4bcc78 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 495f5564..6c844503 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 7ed3ac7a..b3114a6a 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>