diff --git a/src/rngs/os.rs b/src/rngs/os.rs
index 6867c48f426..5f9655773a7 100644
--- a/src/rngs/os.rs
+++ b/src/rngs/os.rs
@@ -405,7 +405,7 @@ mod imp {
     const NR_GETRANDOM: libc::c_long = 278;
      #[cfg(target_arch = "s390x")]
     const NR_GETRANDOM: libc::c_long = 349;
-    #[cfg(target_arch = "powerpc")]
+    #[cfg(any(target_arch = "powerpc", target_arch = "powerpc64"))]
     const NR_GETRANDOM: libc::c_long = 359;
     #[cfg(target_arch = "mips")] // old ABI
     const NR_GETRANDOM: libc::c_long = 4353;
@@ -413,7 +413,8 @@ mod imp {
     const NR_GETRANDOM: libc::c_long = 5313;
     #[cfg(not(any(target_arch = "x86_64", target_arch = "x86",
                   target_arch = "arm", target_arch = "aarch64",
-                  target_arch = "s390x", target_arch = "powerpc",
+                  target_arch = "s390x",
+                  target_arch = "powerpc", target_arch = "powerpc64",
                   target_arch = "mips", target_arch = "mips64")))]
     const NR_GETRANDOM: libc::c_long = 0;