diff --git a/srcpkgs/chmlib/patches/aarch64-ppc64.patch b/srcpkgs/chmlib/patches/aarch64-ppc64-aarch64.patch
similarity index 76%
rename from srcpkgs/chmlib/patches/aarch64-ppc64.patch
rename to srcpkgs/chmlib/patches/aarch64-ppc64-aarch64.patch
index 9342b8e339f..8af0bf17b3e 100644
--- a/srcpkgs/chmlib/patches/aarch64-ppc64.patch
+++ b/srcpkgs/chmlib/patches/aarch64-ppc64-aarch64.patch
@@ -5,7 +5,7 @@
  /* x86-64 */
  /* Note that these may be appropriate for other 64-bit machines. */
 -#elif __x86_64__ || __ia64__
-+#elif __x86_64__ || __ia64__ || __aarch64__ || __powerpc64__
++#elif __x86_64__ || __ia64__ || __aarch64__ || __powerpc64__ || ( defined(__riscv_xlen) && __riscv_xlen == 64)
  typedef unsigned char           UChar;
  typedef short                   Int16;
  typedef unsigned short          UInt16;