diff --git a/src/snprintf.c b/src/snprintf.c
index 3e854e5..651f6f0 100644
--- a/src/snprintf.c
+++ b/src/snprintf.c
@@ -286,6 +286,7 @@ static int dopr (char *buffer, size_t maxlen, const char *format, va_list args)
 	break;
       case 'X':
 	flags |= DP_F_UP;
+	//-fallthrough
       case 'x':
 	flags |= DP_F_UNSIGNED;
 	if (cflags == DP_C_SHORT)
@@ -306,6 +307,7 @@ static int dopr (char *buffer, size_t maxlen, const char *format, va_list args)
 	break;
       case 'E':
 	flags |= DP_F_UP;
+	//-fallthrough
       case 'e':
 	if (cflags == DP_C_LDOUBLE)
 	  fvalue = va_arg (args, LDOUBLE);
@@ -314,6 +316,7 @@ static int dopr (char *buffer, size_t maxlen, const char *format, va_list args)
 	break;
       case 'G':
 	flags |= DP_F_UP;
+	//-fallthrough
       case 'g':
 	if (cflags == DP_C_LDOUBLE)
 	  fvalue = va_arg (args, LDOUBLE);