1 files changed, 2 insertions, 1 deletions
diff --git a/toolsrc/src/vcpkg/build.cpp b/toolsrc/src/vcpkg/build.cpp
index 7e14a0926..385013b9b 100644
--- a/toolsrc/src/vcpkg/build.cpp
+++ b/toolsrc/src/vcpkg/build.cpp
@@ -1120,7 +1120,8 @@ namespace vcpkg::Build
                         pre_build_info.passthrough_env_vars = Strings::split(variable_value, ";");
                         break;
                     case VcpkgTripletVar::PUBLIC_ABI_OVERRIDE :
-                        pre_build_info.public_abi_override = variable_value;
+                        pre_build_info.public_abi_override =
+                            variable_value.empty() ? nullopt : Optional<std::string>{variable_value};
                         break;
                 }
             }