diff --git a/nsprpub/pr/include/md/_linux.h b/nsprpub/pr/include/md/_linux.h
index 774245e52e..3226a04b38 100644
--- a/nsprpub/pr/include/md/_linux.h
+++ b/nsprpub/pr/include/md/_linux.h
@@ -37,6 +37,8 @@
 #define _PR_SI_ARCHITECTURE "sparc"
 #elif defined(__i386__)
 #define _PR_SI_ARCHITECTURE "x86"
+#elif defined(__mips64__)
+#define _PR_SI_ARCHITECTURE "mips64"
 #elif defined(__mips__)
 #define _PR_SI_ARCHITECTURE "mips"
 #elif defined(__arm__)
diff --git a/nsprpub/pr/include/md/_netbsd.h b/nsprpub/pr/include/md/_netbsd.h
index 1ec0fe6ec8..b262acee60 100644
--- a/nsprpub/pr/include/md/_netbsd.h
+++ b/nsprpub/pr/include/md/_netbsd.h
@@ -25,6 +25,8 @@
 #define _PR_SI_ARCHITECTURE "sparc64"
 #elif defined(__sparc__)
 #define _PR_SI_ARCHITECTURE "sparc"
+#elif defined(__mips64__)
+#define _PR_SI_ARCHITECTURE "mips64"
 #elif defined(__mips__)
 #define _PR_SI_ARCHITECTURE "mips"
 #elif defined(__arm32__) || defined(__arm__) || defined(__armel__) \