diff --git a/README.md b/README.md
index 78581ee..75711ec 100644
--- a/README.md
+++ b/README.md
@@ -20,6 +20,8 @@ I'm very happy to accept pull-requests and collaborators.
   doesn't matter.  But for ARM chips it can segfault.
 * `modp_numtoa.c` functions may produce different rounding than whatever
   `printf` is on your system. 
+* On mingw (windows) compiling with `-D__USE_MINGW_ANSI_STDIO` gives the 
+  standard `prinf` behavior.
 
 ## Alpine Linux / musl-libc
 
diff --git a/src/Makefile.am b/src/Makefile.am
index 2243659..add0026 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -1,5 +1,6 @@
 
 include_HEADERS = \
+	extern_c_begin.h extern_c_end.h \
 	modp_b16.h modp_b64.h modp_b64w.h modp_b64r.h \
 	modp_b85.h modp_burl.h modp_bjavascript.h \
 	modp_numtoa.h modp_ascii.h modp_b2.h \
diff --git a/src/modp_ascii.c b/src/modp_ascii.c
index 81a6f8e..6b59855 100644
--- a/src/modp_ascii.c
+++ b/src/modp_ascii.c
@@ -40,10 +40,13 @@ void modp_toupper_copy(char* dest, const char* str, size_t len)
     switch (leftover) {
     case 3:
         *dest++ = (char)gsToUpperMap[ustr[i++]];
+        /* fall through */
     case 2:
         *dest++ = (char)gsToUpperMap[ustr[i++]];
+        /* fall through */
     case 1:
         *dest++ = (char)gsToUpperMap[ustr[i]];
+        /* fall through */
     case 0:
         *dest = '\0';
     }
@@ -75,10 +78,13 @@ void modp_tolower_copy(char* dest, const char* str, size_t len)
     switch (leftover) {
     case 3:
         *dest++ = (char)gsToLowerMap[ustr[i++]];
+        /* fall through */
     case 2:
         *dest++ = (char)gsToLowerMap[ustr[i++]];
+        /* fall through */
     case 1:
         *dest++ = (char)gsToLowerMap[ustr[i]];
+        /* fall through */
     case 0:
         *dest = '\0';
     }
@@ -121,10 +127,13 @@ void modp_toprint_copy(char* dest, const char* str, size_t len)
     switch (leftover) {
     case 3:
         *dest++ = (char)gsToPrintMap[s[i++]];
+        /* fall through */
     case 2:
         *dest++ = (char)gsToPrintMap[s[i++]];
+        /* fall through */
     case 1:
         *dest++ = (char)gsToPrintMap[s[i]];
+        /* fall through */
     case 0:
         *dest = '\0';
     }
diff --git a/test/speedtest_numtoa.c b/test/speedtest_numtoa.c
index e9239c8..65356b8 100644
--- a/test/speedtest_numtoa.c
+++ b/test/speedtest_numtoa.c
@@ -2,7 +2,7 @@
  * trick gcc to accepting snprintf which is a C99-ism
  */
 #define _ISOC99_SOURCE
-#define _BSD_SOURCE
+#define _DEFAULT_SOURCE
 #define _XOPEN_SOURCE 500
 #define _POSIX_C_SOURCE 200112L
 #include <stdint.h>