diff --git a/flang/test/Driver/fast_math.f90 b/flang/test/Driver/fast_math.f90
--- a/flang/test/Driver/fast_math.f90
+++ b/flang/test/Driver/fast_math.f90
@@ -70,6 +70,8 @@
 ! UNSUPPORTED: system-windows
 ! UNSUPPORTED: target=powerpc{{.*}}
 ! RUN: %flang -ffast-math -### %s -o %t 2>&1 \
+! RUN:           --target=x86_64-unknown-linux -no-pie --gcc-toolchain="" \
+! RUN:           --sysroot=%S/../../../clang/test/Driver/Inputs/basic_linux_tree \
 ! RUN:     | FileCheck --check-prefix=CHECK-CRT %s
 ! CHECK-CRT: {{crtbegin.?\.o}}
 ! CHECK-CRT-SAME: crtfastmath.o