diff --git a/src/compiler/msvc.rs b/src/compiler/msvc.rs
index 61b5ccab7..1e58a077b 100644
--- a/src/compiler/msvc.rs
+++ b/src/compiler/msvc.rs
@@ -438,6 +438,7 @@ msvc_args!(static ARGS: [ArgInfo<ArgData>; _] = [
     msvc_take_arg!("clr:", OsString, Concatenated, PassThroughWithSuffix),
     msvc_take_arg!("constexpr:", OsString, Concatenated, PassThroughWithSuffix),
     msvc_flag!("d1nodatetime", PassThrough),
+    msvc_flag!("d20bforceinline", PassThrough),
     msvc_take_arg!("deps", PathBuf, Concatenated, DepFile),
     msvc_take_arg!("diagnostics:", OsString, Concatenated, PassThroughWithSuffix),
     msvc_take_arg!("doc", PathBuf, Concatenated, TooHardPath), // Creates an .xdc file.
@@ -2292,6 +2293,7 @@ mod test {
             "-Qpar-",
             "-Gw",
             "/d1nodatetime",
+            "/d20bforceinline",
             "-EHa",
             "-await:strict",
             "/YI",
@@ -2325,6 +2327,7 @@ mod test {
                 "-Qpar-",
                 "-Gw",
                 "/d1nodatetime",
+                "/d20bforceinline",
                 "-EHa",
                 "-await:strict",
                 "/YI",