diff --git a/build_msvc/libsecp256k1/libsecp256k1.vcxproj b/build_msvc/libsecp256k1/libsecp256k1.vcxproj
index 585c28e503..777515aa3a 100644
--- a/build_msvc/libsecp256k1/libsecp256k1.vcxproj
+++ b/build_msvc/libsecp256k1/libsecp256k1.vcxproj
@@ -14,7 +14,7 @@
   </ItemGroup>
   <ItemDefinitionGroup>
     <ClCompile>
-      <PreprocessorDefinitions>ENABLE_MODULE_RECOVERY;ENABLE_MODULE_EXTRAKEYS;ENABLE_MODULE_SCHNORRSIG;%(PreprocessorDefinitions)</PreprocessorDefinitions>
+      <PreprocessorDefinitions>ENABLE_MODULE_RECOVERY;ENABLE_MODULE_EXTRAKEYS;ENABLE_MODULE_SCHNORRSIG;ENABLE_MODULE_ELLSWIFT;%(PreprocessorDefinitions)</PreprocessorDefinitions>
       <UndefinePreprocessorDefinitions>USE_ASM_X86_64;%(UndefinePreprocessorDefinitions)</UndefinePreprocessorDefinitions>
       <AdditionalIncludeDirectories>..\..\src\secp256k1;%(AdditionalIncludeDirectories)</AdditionalIncludeDirectories>
       <DisableSpecificWarnings>4146;4244;4267;4334</DisableSpecificWarnings>