diff --git a/crates/rust-analyzer/src/cli/analysis_stats.rs b/crates/rust-analyzer/src/cli/analysis_stats.rs
index e899e0e..2851101 100644
--- a/crates/rust-analyzer/src/cli/analysis_stats.rs
+++ b/crates/rust-analyzer/src/cli/analysis_stats.rs
@@ -81,7 +81,13 @@
             with_proc_macro_server: if self.disable_proc_macros {
                 ProcMacroServerChoice::None
             } else {
-                ProcMacroServerChoice::Sysroot
+                match self.proc_macro_srv {
+                    Some(ref path) => {
+                        let path = vfs::AbsPathBuf::assert_utf8(path.to_owned());
+                        ProcMacroServerChoice::Explicit(path)
+                    }
+                    None => ProcMacroServerChoice::Sysroot,
+                }
             },
             prefill_caches: false,
         };
diff --git a/crates/rust-analyzer/src/cli/flags.rs b/crates/rust-analyzer/src/cli/flags.rs
index 73e7165..60d621b 100644
--- a/crates/rust-analyzer/src/cli/flags.rs
+++ b/crates/rust-analyzer/src/cli/flags.rs
@@ -76,6 +76,8 @@
             optional --disable-build-scripts
             /// Don't use expand proc macros.
             optional --disable-proc-macros
+            /// Run the proc-macro-srv binary at the specified path.
+            optional --proc-macro-srv path: PathBuf
             /// Skip body lowering.
             optional --skip-lowering
             /// Skip type inference.
@@ -120,7 +122,7 @@
             optional --disable-build-scripts
             /// Don't use expand proc macros.
             optional --disable-proc-macros
-            /// Run a custom proc-macro-srv binary.
+            /// Run the proc-macro-srv binary at the specified path.
             optional --proc-macro-srv path: PathBuf
         }
 
@@ -133,7 +135,7 @@
             optional --disable-build-scripts
             /// Don't use expand proc macros.
             optional --disable-proc-macros
-            /// Run a custom proc-macro-srv binary.
+            /// Run the proc-macro-srv binary at the specified path.
             optional --proc-macro-srv path: PathBuf
         }
 
@@ -233,6 +235,7 @@
     pub no_sysroot: bool,
     pub disable_build_scripts: bool,
     pub disable_proc_macros: bool,
+    pub proc_macro_srv: Option<PathBuf>,
     pub skip_lowering: bool,
     pub skip_inference: bool,
     pub skip_mir_stats: bool,