diff --git a/src/zcash/prf.cpp b/src/zcash/prf.cpp
index 1aa8142d8..99e9868e8 100644
--- a/src/zcash/prf.cpp
+++ b/src/zcash/prf.cpp
@@ -27,7 +27,7 @@ std::array<unsigned char, 64> PRF_expand(const uint256& sk, unsigned char t)
 uint256 PRF_rcm(const uint256& rseed)
 {
     uint256 rcm;
-    auto tmp = PRF_expand(rseed, 4);
+    auto tmp = PRF_expand(rseed, PRF_RCM_DIVERSIFIER);
     librustzcash_to_scalar(tmp.data(), rcm.begin());
     return rcm;
 }
@@ -35,7 +35,7 @@ uint256 PRF_rcm(const uint256& rseed)
 uint256 PRF_esk(const uint256& rseed)
 {
     uint256 esk;
-    auto tmp = PRF_expand(rseed, 5);
+    auto tmp = PRF_expand(rseed, PRF_ESK_DIVERSIFIER);
     librustzcash_to_scalar(tmp.data(), esk.begin());
     return esk;
 }
@@ -43,7 +43,7 @@ uint256 PRF_esk(const uint256& rseed)
 uint256 PRF_ask(const uint256& sk)
 {
     uint256 ask;
-    auto tmp = PRF_expand(sk, 0);
+    auto tmp = PRF_expand(sk, PRF_ASK_DIVERSIFIER);
     librustzcash_to_scalar(tmp.data(), ask.begin());
     return ask;
 }
@@ -51,7 +51,7 @@ uint256 PRF_ask(const uint256& sk)
 uint256 PRF_nsk(const uint256& sk)
 {
     uint256 nsk;
-    auto tmp = PRF_expand(sk, 1);
+    auto tmp = PRF_expand(sk, PRF_NSK_DIVERSIFIER);
     librustzcash_to_scalar(tmp.data(), nsk.begin());
     return nsk;
 }
@@ -59,7 +59,7 @@ uint256 PRF_nsk(const uint256& sk)
 uint256 PRF_ovk(const uint256& sk)
 {
     uint256 ovk;
-    auto tmp = PRF_expand(sk, 2);
+    auto tmp = PRF_expand(sk, PRF_OVK_DIVERSIFIER);
     memcpy(ovk.begin(), tmp.data(), 32);
     return ovk;
 }
diff --git a/src/zcash/prf.h b/src/zcash/prf.h
index b9256769a..5ab3ed1a3 100644
--- a/src/zcash/prf.h
+++ b/src/zcash/prf.h
@@ -25,6 +25,12 @@ uint256 PRF_ovk(const uint256& sk);
 uint256 PRF_rcm(const uint256& rseed);
 uint256 PRF_esk(const uint256& rseed);
 
+const char PRF_ASK_DIVERSIFIER = 0;
+const char PRF_NSK_DIVERSIFIER = 1;
+const char PRF_OVK_DIVERSIFIER = 2;
+const char PRF_RCM_DIVERSIFIER = 4;
+const char PRF_ESK_DIVERSIFIER = 5;
+
 std::array<unsigned char, 11> default_diversifier(const uint256& sk);
 
 #endif // ZC_PRF_H_