diff --git a/src/core/os.c b/src/core/os.c
index 6f68fafe..837375cb 100644
--- a/src/core/os.c
+++ b/src/core/os.c
@@ -159,6 +159,8 @@ static Janet os_arch(int32_t argc, Janet *argv) {
     return janet_ckeywordv("arm");
 #elif (defined(__sparc__))
     return janet_ckeywordv("sparc");
+#elif (defined(__ppc__))
+    return janet_ckeywordv("ppc");
 #else
     return janet_ckeywordv("unknown");
 #endif