Index: src/runtime/lookup-asm/lookup-asm.S
==================================================================
--- src/runtime/lookup-asm/lookup-asm.S
+++ src/runtime/lookup-asm/lookup-asm.S
@@ -26,11 +26,11 @@
 # elif defined(__ppc__) || defined(__PPC__)
 #  include "lookup-asm-ppc-elf.S"
 # elif (defined(_MIPS_SIM) && _MIPS_SIM == _ABIO32) || \
 	(defined(__mips_eabi) && _MIPS_SZPTR == 32)
 #  include "lookup-asm-mips-elf.S"
-# elif defined(__sparc__)
+# elif defined(__sparc__) && !defined(__arch64__)
 #  include "lookup-asm-sparc-elf.S"
 # endif
 #elif defined(__MACH__)
 # if defined(__x86_64__)
 #  include "lookup-asm-x86_64-macho.S"

Index: src/runtime/runtime-private.h
==================================================================
--- src/runtime/runtime-private.h
+++ src/runtime/runtime-private.h
@@ -180,16 +180,19 @@
 }
 
 #if defined(__ELF__)
 # if defined(__x86_64__) || defined(__amd64__) || defined(__i386__) || \
 	defined(__ppc__) || defined(__PPC__) || defined(__arm__) || \
-	defined(__ARM__) || defined(__sparc__)
+	defined(__ARM__)
 #  define OF_ASM_LOOKUP
 # endif
 # if (defined(_MIPS_SIM) && _MIPS_SIM == _ABIO32) || \
 	(defined(__mips_eabi) && _MIPS_SZPTR == 32)
 #  define OF_ASM_LOOKUP
+# endif
+# if defined(__sparc__) && !defined(__arch64__)
+#  define OF_ASM_LOOKUP
 # endif
 #elif defined(__MACH__)
 # if defined(__x86_64__) || defined(__ppc__)
 #  define OF_ASM_LOOKUP
 # endif