diff --git a/src/x86/asmnames.h b/src/x86/asmnames.h
new file mode 100644
index 0000000..7551021
--- /dev/null
+++ b/src/x86/asmnames.h
@@ -0,0 +1,30 @@
+#ifndef ASMNAMES_H
+#define ASMNAMES_H
+
+#define C2(X, Y)  X ## Y
+#define C1(X, Y)  C2(X, Y)
+#ifdef __USER_LABEL_PREFIX__
+# define C(X)     C1(__USER_LABEL_PREFIX__, X)
+#else
+# define C(X)     X
+#endif
+
+#ifdef __APPLE__
+# define L(X)     C1(L, X)
+#else
+# define L(X)     C1(.L, X)
+#endif
+
+#if defined(__ELF__) && defined(__PIC__)
+# define PLT(X)	  X@PLT
+#else
+# define PLT(X)	  X
+#endif
+
+#ifdef __ELF__
+# define ENDF(X)  .type	X,@function; .size X, . - X
+#else
+# define ENDF(X)
+#endif
+
+#endif /* ASMNAMES_H */
diff --git a/src/x86/unix64.S b/src/x86/unix64.S
index c83010c..129aba5 100644
--- a/src/x86/unix64.S
+++ b/src/x86/unix64.S
@@ -31,31 +31,10 @@
 #include <fficonfig.h>
 #include <ffi.h>
 #include "internal64.h"
+#include "asmnames.h"
 
 	.text
 
-#define C2(X, Y)  X ## Y
-#define C1(X, Y)  C2(X, Y)
-#ifdef __USER_LABEL_PREFIX__
-# define C(X)     C1(__USER_LABEL_PREFIX__, X)
-#else
-# define C(X)     X
-#endif
-
-#ifdef __APPLE__
-# define L(X)     C1(L, X)
-#else
-# define L(X)     C1(.L, X)
-#endif
-
-#ifdef __ELF__
-# define PLT(X)	  X@PLT
-# define ENDF(X)  .type	X,@function; .size X, . - X
-#else
-# define PLT(X)	  X
-# define ENDF(X)
-#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.  */
diff --git a/src/x86/win64.S b/src/x86/win64.S
index eed57c2..9d4f8b9 100644
--- a/src/x86/win64.S
+++ b/src/x86/win64.S
@@ -2,6 +2,7 @@
 #include <fficonfig.h>
 #include <ffi.h>
 #include <ffi_cfi.h>
+#include "asmnames.h"
 
 #if defined(HAVE_AS_CFI_PSEUDO_OP)
         .cfi_sections   .debug_frame
@@ -21,12 +22,6 @@
 #define arg3	%rcx
 #endif
 
-#ifdef SYMBOL_UNDERSCORE
-#define SYMBOL_NAME(name) _##name
-#else
-#define SYMBOL_NAME(name) name
-#endif
-
 .macro E which
 	.align	8
 	.org	0b + \which * 8
@@ -106,7 +101,7 @@ E FFI_TYPE_DOUBLE
 	movsd	%xmm0, (%r8)
 	epilogue
 E FFI_TYPE_LONGDOUBLE
-	call	abort
+	call	PLT(C(abort))
 E FFI_TYPE_UINT8
 	movzbl	%al, %eax
 	movq	%rax, (%r8)
@@ -141,7 +136,7 @@ E FFI_TYPE_POINTER
 	movq	%rax, (%r8)
 	epilogue
 E FFI_TYPE_COMPLEX
-	call	abort
+	call	PLT(C(abort))
 E FFI_TYPE_SMALL_STRUCT_1B
 	movb	%al, (%r8)
 	epilogue
@@ -153,7 +148,7 @@ E FFI_TYPE_SMALL_STRUCT_4B
 	epilogue
 
 	.align	8
-99:	call	abort
+99:	call	PLT(C(abort))
 
 .purgem epilogue