diff --git a/nss-kremlin-ppc64le.patch b/nss-kremlin-ppc64le.patch
new file mode 100644
index 0000000..b5f4700
--- /dev/null
+++ b/nss-kremlin-ppc64le.patch
@@ -0,0 +1,31 @@
+Index: nss/lib/freebl/verified/kremlin/include/kremlin/internal/types.h
+===================================================================
+--- nss.orig/lib/freebl/verified/kremlin/include/kremlin/internal/types.h
++++ nss/lib/freebl/verified/kremlin/include/kremlin/internal/types.h
+@@ -56,9 +56,10 @@ typedef const char *Prims_string;
+     !defined(__clang__)
+ #include <emmintrin.h>
+ typedef __m128i FStar_UInt128_uint128;
+-#elif !defined(KRML_VERIFIED_UINT128) && !defined(_MSC_VER) &&           \
++#elif !defined(KRML_VERIFIED_UINT128) && !defined(_MSC_VER) && \
+     (defined(__x86_64__) || defined(__x86_64) || defined(__aarch64__) || \
+-     (defined(__powerpc64__) && defined(__LITTLE_ENDIAN__)))
++    (defined(__powerpc64__) && defined(__LITTLE_ENDIAN__)) || \
++     defined(__s390x__))
+ typedef unsigned __int128 FStar_UInt128_uint128;
+ #elif !defined(KRML_VERIFIED_UINT128) && defined(_MSC_VER) && defined(__clang__)
+ typedef __uint128_t FStar_UInt128_uint128;
+Index: nss/lib/freebl/verified/kremlin/kremlib/dist/minimal/fstar_uint128_gcc64.h
+===================================================================
+--- nss.orig/lib/freebl/verified/kremlin/kremlib/dist/minimal/fstar_uint128_gcc64.h
++++ nss/lib/freebl/verified/kremlin/kremlib/dist/minimal/fstar_uint128_gcc64.h
+@@ -26,7 +26,8 @@
+ 
+ #if !defined(KRML_VERIFIED_UINT128) && (!defined(_MSC_VER) || defined(__clang__)) && \
+     (defined(__x86_64__) || defined(__x86_64) || defined(__aarch64__) ||             \
+-     (defined(__powerpc64__) && defined(__LITTLE_ENDIAN__)))
++    (defined(__powerpc64__) && defined(__LITTLE_ENDIAN__)) || \
++     defined(__s390x__))
+ 
+ /* GCC + using native unsigned __int128 support */
+ 
diff --git a/nss.spec b/nss.spec
index 8a0c2ba..fe76971 100644
--- a/nss.spec
+++ b/nss.spec
@@ -107,6 +107,8 @@ Patch2:           nss-539183.patch
 # but it doesn't hurt to keep it.
 Patch4:           iquote.patch
 Patch12:          nss-signtool-format.patch
+# https://github.com/FStarLang/kremlin/issues/166
+Patch13:          nss-kremlin-ppc64le.patch
 
 %description
 Network Security Services (NSS) is a set of libraries designed to