diff --git a/cbits/decaf/ed448goldilocks/decaf.c b/cbits/decaf/ed448goldilocks/decaf.c
index 8ee6029..579c2ce 100644
--- a/cbits/decaf/ed448goldilocks/decaf.c
+++ b/cbits/decaf/ed448goldilocks/decaf.c
@@ -1530,13 +1530,13 @@ prepare_wnaf_table(
 
 extern const gf API_NS(precomputed_wnaf_as_fe)[];
 static const niels_t *API_NS(wnaf_base) = (const niels_t *)API_NS(precomputed_wnaf_as_fe);
-const size_t API_NS(sizeof_precomputed_wnafs) __attribute((visibility("hidden")))
+const size_t API_NS(sizeof_precomputed_wnafs)
     = sizeof(niels_t)<<CRYPTONITE_DECAF_WNAF_FIXED_TABLE_BITS;
 
 void API_NS(precompute_wnafs) (
     niels_t out[1<<CRYPTONITE_DECAF_WNAF_FIXED_TABLE_BITS],
     const point_t base
-) __attribute__ ((visibility ("hidden")));
+);
 
 void API_NS(precompute_wnafs) (
     niels_t out[1<<CRYPTONITE_DECAF_WNAF_FIXED_TABLE_BITS],
diff --git a/cbits/decaf/ed448goldilocks/decaf_tables.c b/cbits/decaf/ed448goldilocks/decaf_tables.c
index 390ea89..c6d2af7 100644
--- a/cbits/decaf/ed448goldilocks/decaf_tables.c
+++ b/cbits/decaf/ed448goldilocks/decaf_tables.c
@@ -11,7 +11,7 @@ const API_NS(point_t) API_NS(point_base) = {{
   {FIELD_LITERAL(0x008f205b70660415,0x00881c60cfd3824f,0x00377a638d08500d,0x008c66d5d4672615,0x00e52fa558e08e13,0x0087770ae1b6983d,0x004388f55a0aa7ff,0x00b4d9a785cf1a91)}
 }};
 const gf API_NS(precomputed_base_as_fe)[240]
-VECTOR_ALIGNED __attribute__((visibility("hidden"))) = {
+VECTOR_ALIGNED = {
   {FIELD_LITERAL(0x00e614a9f7278dc5,0x002e454ad04c5124,0x00d8f58cee1436f3,0x00c83ed46e4180ec,0x00a41e93274a38fa,0x00c1e7e53257771e,0x0043e0ff03c0392f,0x002c7c6405ce61df)},
   {FIELD_LITERAL(0x0033c4f9dc990b33,0x00c291cb1ceb55c3,0x002ae3f58ade88b2,0x006b1f9f11395474,0x002ded6e4b27ff7c,0x0041012ed4aa10e1,0x003c22d20a36bae7,0x001f584eed472b19)},
   {FIELD_LITERAL(0x00c3514779ee6f60,0x001574c873b20c2b,0x004cd6a46a5a5e65,0x0059a068aeb4204a,0x004c610458bc354d,0x00e94567479d02d2,0x00feaf77ed118e28,0x00f58a8bf115eeb5)},
@@ -254,7 +254,7 @@ VECTOR_ALIGNED __attribute__((visibility("hidden"))) = {
   {FIELD_LITERAL(0x00bba0ed9c67c41f,0x00b30c8e225ba195,0x008bb5762a5cef18,0x00e0df31b06fb7cc,0x0018b912141991d5,0x00f6ed54e093eac2,0x0009e288264dbbb3,0x00feb663299b89ef)}
 };
 const gf API_NS(precomputed_wnaf_as_fe)[96]
-VECTOR_ALIGNED __attribute__((visibility("hidden"))) = {
+VECTOR_ALIGNED = {
   {FIELD_LITERAL(0x00cfc32590115acd,0x0079f0e2a5c7af1b,0x00dd94605b8d7332,0x0097dd6c75f5f3f3,0x00d9c59e36156de9,0x00edfbfd6cde47d7,0x0095b97c9f67c39a,0x007d7b90f587debc)},
   {FIELD_LITERAL(0x00cfc32590115acd,0x0079f0e2a5c7af1b,0x00dd94605b8d7332,0x0017dd6c75f5f3f3,0x00d9c59e36156de8,0x00edfbfd6cde47d7,0x0095b97c9f67c39a,0x00fd7b90f587debc)},
   {FIELD_LITERAL(0x001071dd4d8ae672,0x004f14ebe5f4f174,0x00e0987625c34c73,0x0092d00712c6f8c1,0x009ef424965e980b,0x00a8e0cf9369764b,0x000aa81907b4d207,0x00d5002c74d37924)},
diff --git a/cbits/decaf/include/portable_endian.h b/cbits/decaf/include/portable_endian.h
index 5d3668e..8418e9f 100644
--- a/cbits/decaf/include/portable_endian.h
+++ b/cbits/decaf/include/portable_endian.h
@@ -1 +1,6 @@
 /* portable_endian.h not used */
+
+#if defined(__MINGW32__)
+// does not exist on MinGW, but unused anyway
+extern int posix_memalign(void **, size_t, size_t);
+#endif
diff --git a/cbits/decaf/tools/generate.sh b/cbits/decaf/tools/generate.sh
index 7d07d0d..8f1a16f 100755
--- a/cbits/decaf/tools/generate.sh
+++ b/cbits/decaf/tools/generate.sh
@@ -26,6 +26,13 @@
 #   aligned(16).  This removes warnings on OpenBSD with GCC 4.2.1, and makes
 #   sure we get at least 16-byte alignment.  32-byte alignment is necessary
 #   only for AVX2 and arch_x86_64, which we don't have.
+#
+# * visibility("hidden") attributes are removed, as this is not supported
+#   on Windows/MinGW, and we have name mangling instead
+#
+# * function posix_memalign is defined in order to avoid a warning on
+#   Windows/MinGW.  Hopefully it is not called.  This definition is put
+#   inside portable_endian.h because this file is already included.
 
 SRC_DIR="$1/src"
 DEST_DIR="`dirname "$0"`"/..
@@ -47,6 +54,9 @@ convert() {
   fi
 
   sed <"$1" >"$2/$FILE_NAME" \
+    -e 's/ __attribute((visibility("hidden")))//g' \
+    -e 's/ __attribute__((visibility("hidden")))//g' \
+    -e 's/ __attribute__ ((visibility ("hidden")))//g' \
     -e "s/__attribute__((aligned(32)))/$REPL/g" \
     -e 's/decaf_/cryptonite_decaf_/g' \
     -e 's/DECAF_/CRYPTONITE_DECAF_/g' \
@@ -103,4 +113,9 @@ done
 
 cat >"$DEST_DIR"/include/portable_endian.h <<EOF
 /* portable_endian.h not used */
+
+#if defined(__MINGW32__)
+// does not exist on MinGW, but unused anyway
+extern int posix_memalign(void **, size_t, size_t);
+#endif
 EOF