diff --git a/src/base.c b/src/base.c
index 43788ef..dd80818 100644
--- a/src/base.c
+++ b/src/base.c
@@ -248,7 +248,7 @@ static SEXP rawToChar(const unsigned char *buf, const size_t sz) {
   if (sz - i > 1) {
     REprintf("data could not be converted to a character string\n");
     out = Rf_allocVector(RAWSXP, sz);
-    memcpy(DATAPTR(out), buf, sz);
+    memcpy(SB_DATAPTR(out), buf, sz);
     return out;
   }
   
@@ -377,7 +377,7 @@ SEXP secretbase_base64enc(SEXP x, SEXP convert) {
     out = rawToChar(buf, olen);
   } else {
     out = Rf_allocVector(RAWSXP, olen);
-    memcpy(DATAPTR(out), buf, olen);
+    memcpy(SB_DATAPTR(out), buf, olen);
   }
   
   R_Free(buf);
@@ -416,7 +416,7 @@ SEXP secretbase_base64dec(SEXP x, SEXP convert) {
   switch (*(int *) DATAPTR_RO(convert)) {
   case 0:
     out = Rf_allocVector(RAWSXP, olen);
-    memcpy(DATAPTR(out), buf, olen);
+    memcpy(SB_DATAPTR(out), buf, olen);
     break;
   case 1:
     out = rawToChar(buf, olen);
diff --git a/src/secret.c b/src/secret.c
index 50c625d..60ff4a3 100644
--- a/src/secret.c
+++ b/src/secret.c
@@ -214,7 +214,7 @@ static void mbedtls_sha3_finish(mbedtls_sha3_context *ctx, uint8_t *output, size
 
 // secretbase - internals ------------------------------------------------------
 
-static inline int R_Integer(SEXP x) {
+static inline int nano_integer(SEXP x) {
   int out;
   switch (TYPEOF(x)) {
   case INTSXP:
@@ -315,7 +315,7 @@ SEXP hash_to_sexp(unsigned char *buf, size_t sz, int conv) {
   SEXP out;
   if (conv == 0) {
     out = Rf_allocVector(RAWSXP, sz);
-    memcpy(DATAPTR(out), buf, sz);
+    memcpy(SB_DATAPTR(out), buf, sz);
   } else if (conv == 1) {
     char cbuf[sz + sz + 1];
     char *cptr = cbuf;
@@ -326,7 +326,7 @@ SEXP hash_to_sexp(unsigned char *buf, size_t sz, int conv) {
     UNPROTECT(1);
   } else {
     out = Rf_allocVector(INTSXP, sz / sizeof(int));
-    memcpy(DATAPTR(out), buf, sz);
+    memcpy(SB_DATAPTR(out), buf, sz);
   }
   
   return out;
@@ -338,7 +338,7 @@ static SEXP secretbase_sha3_impl(const SEXP x, const SEXP bits, const SEXP conve
                                  const int offset) {
   
   const int conv = LOGICAL(convert)[0];
-  const int bt = R_Integer(bits);
+  const int bt = nano_integer(bits);
   mbedtls_sha3_id id;
   
   if (offset < 0) {
diff --git a/src/secret.h b/src/secret.h
index 54c13d6..6920afb 100644
--- a/src/secret.h
+++ b/src/secret.h
@@ -26,6 +26,8 @@
 #include <Rinternals.h>
 #include <R_ext/Visibility.h>
 
+#define SB_DATAPTR(x) (void *) DATAPTR_RO(x)
+
 #define SB_R_SERIAL_VER 3
 #define SB_SERIAL_HEADERS 6
 #define SB_BUF_SIZE 4096