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-rw-r--r--src/tools/compiletest/src/runtest.rs2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/tools/compiletest/src/runtest.rs b/src/tools/compiletest/src/runtest.rs
index 5daf192e2db..cc00f200171 100644
--- a/src/tools/compiletest/src/runtest.rs
+++ b/src/tools/compiletest/src/runtest.rs
@@ -2529,7 +2529,7 @@ impl<'test> TestCx<'test> {
                 .env("IS_WINDOWS", "1")
                 .env("MSVC_LIB", format!("'{}' -nologo", lib.display()))
                 .env("CC", format!("'{}' {}", self.config.cc, cflags))
-                .env("CXX", &self.config.cxx);
+                .env("CXX", format!("'{}'", &self.config.cxx));
         } else {
             cmd.env("CC", format!("{} {}", self.config.cc, self.config.cflags))
                 .env("CXX", format!("{} {}", self.config.cxx, self.config.cflags))