diff --git a/compiler/src/dmd/link.d b/compiler/src/dmd/link.d
index 750c57cf58..b93b9fd17d 100644
--- a/compiler/src/dmd/link.d
+++ b/compiler/src/dmd/link.d
@@ -993,7 +993,7 @@ public int runPreprocessor(Loc loc, const(char)[] cpp, const(char)[] filename, c
                  */
                 OutBuffer buf;
                 buf.writestring(cpp);
-                buf.printf(" /P /Zc:preprocessor /PD /nologo /utf-8 %.*s /FI%s /Fi%.*s",
+                buf.printf(" /P /Zc:preprocessor /PD /nologo /utf-8 \"%.*s\" \"/FI%s\" \"/Fi%.*s\"",
                     cast(int)filename.length, filename.ptr, importc_h, cast(int)output.length, output.ptr);
 
                 /* Append preprocessor switches to command line