diff --git a/racket/src/racket/sconfig.h b/racket/src/racket/sconfig.h
index f6e90bc29c..27fb376ea5 100644
--- a/racket/src/racket/sconfig.h
+++ b/racket/src/racket/sconfig.h
@@ -173,9 +173,16 @@
 #  define MZ_TRY_EXTFLONUMS
 #  define ASM_DBLPREC_CONTROL_87
 # endif
-# if defined(__powerpc__)
+# if defined(__powerpc__) && !defined(__powerpc64__)
 #  define SCHEME_PLATFORM_LIBRARY_SUBPATH "ppc-"SPLS_LINUX
 # endif
+# if defined(__powerpc64__)
+#  if defined(__LITTLE_ENDIAN__)
+#   define SCHEME_PLATFORM_LIBRARY_SUBPATH "ppc64le-"SPLS_LINUX
+#  else
+#   define SCHEME_PLATFORM_LIBRARY_SUBPATH "ppc64-"SPLS_LINUX
+#  endif
+# endif
 # if defined(__mc68000__)
 #  define SCHEME_PLATFORM_LIBRARY_SUBPATH "m68k-"SPLS_LINUX
 # endif
@@ -247,7 +254,7 @@
 # define MZ_JIT_USE_MPROTECT
 # define MZ_USE_DWARF_LIBUNWIND
 #endif
-#if defined(__powerpc__)
+#if defined(__powerpc__) && !defined(__powerpc64__)
 # define MZ_USE_JIT_PPC
 #endif
 # if defined(__arm__)