https://github.com/libffi/libffi/pull/579

diff --git a/js/src/ctypes/libffi/src/x86/sysv.S b/js/src/ctypes/libffi/src/x86/sysv.S
index 7c9598c93c984..b73492795d6d0 100644
--- a/js/src/ctypes/libffi/src/x86/sysv.S
+++ b/js/src/ctypes/libffi/src/x86/sysv.S
@@ -51,18 +51,18 @@
 #ifdef __ELF__
 # define ENDF(X)  .type	X,@function; .size X, . - X
 #else
 # define ENDF(X)
 #endif
 
 /* Handle win32 fastcall name mangling.  */
 #ifdef X86_WIN32
-# define ffi_call_i386		@ffi_call_i386@8
-# define ffi_closure_inner	@ffi_closure_inner@8
+# define ffi_call_i386		"@ffi_call_i386@8"
+# define ffi_closure_inner	"@ffi_closure_inner@8"
 #else
 # define ffi_call_i386		C(ffi_call_i386)
 # define ffi_closure_inner	C(ffi_closure_inner)
 #endif
 
 /* This macro allows the safe creation of jump tables without an
    actual table.  The entry points into the table are all 8 bytes.
    The use of ORG asserts that we're at the correct location.  */