diff --git a/.travis.yml b/.travis.yml
index 4677c69..ea4cd7d 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,3 +1,5 @@
+dist: trusty
+
 language: c
 compiler:
  - clang
@@ -17,6 +19,7 @@ script:
 # Coverity Scan configuration
 env:
   global:
+   - CFLAGS="-Wno-unused-result"
    - secure: "mvZ7LO2lCFicTg+L3c4PvDeXtMR7ez2pfPYJ/BSYLknTx1yzz31p9k1lwFPnG86oBK4A5MxnlGj+LAfLBRR2ZxvVh5enQyjqSSFfGzG06bmSmfzbM+wkveTzFiKyAnWyzd0bFshsU0tuFXU4QH3jiO+/QO+ixybNyw2wgC+yBz0/OBmzIVKvoK7mqBl31givL6YsLPF5HdipMZK7KHYxp1Kjj36AF1QmsivMKalMjBGIh5PeJ8QY3R/GDdy+I2zEyAS1a6fFMcBbCQrjPl4eQJ/y6pl3EuvMfeSjRUPXvzEf9fiwZcuiw9KY0EDtYuIAyzaBUTHuW/tO359LbLYI4X2V3SgA5b58H0zDvavssRzAp/l/bYq70Q0n1Xz/aF1R01SDqG48BFMWWT3eb7eLIeZNapPLOWk07D801Wpt8XYbfEDZZ5FA5UK/o8DBAlIEDivFLkuG2+vv9wMwY0qkTQ8ZyBvfSRa/pjVBpiPiPRO5Pg6UrnPOHnX7hf+IGa1U38vY8S8sBdA0Xc4QSH3K7dQZc33N12Nhrbp9hQR5WFPz35CZVnf77XPLSWocG1icb6tFF2ybzE26XiUXzRy6eaVkfcNlAvtUl4Rci7520436bJnNfZiFMD9Lj4Wy/td89guqboH2jETcHbly5h5yqfL+95pCt+0i3zCtC0GfrbU="
 addons:
   coverity_scan:
diff --git a/configure.ac b/configure.ac
index b7c35d5..225d377 100644
--- a/configure.ac
+++ b/configure.ac
@@ -165,7 +165,7 @@ AM_CONDITIONAL([RSAREF_TESTS], [test x"enable_rsaref_tests" = x"yes"])
 AC_ARG_ENABLE([developer-warnings],
     AS_HELP_STRING([--enable-developer-warnings],
 	[enable strict warnings (default is NO)]),
-    [CFLAGS="${CFLAGS} -Wall -Wextra -Wcast-qual -Wshadow -Wno-unused-result"])
+    [CFLAGS="${CFLAGS} -Wall -Wextra -Wcast-qual -Wshadow"])
 AC_ARG_ENABLE([debugging-symbols],
     AS_HELP_STRING([--enable-debugging-symbols],
 	[enable debugging symbols (default is NO)]),
diff --git a/lib/test/cryb_t_main.c b/lib/test/cryb_t_main.c
index 8c22c91..b1f2a6a 100644
--- a/lib/test/cryb_t_main.c
+++ b/lib/test/cryb_t_main.c
@@ -139,7 +139,8 @@ t_add_test(t_func *func, void *arg, const char *fmt, ...)
 		err(1, "malloc()");
 	t->func = func;
 	va_start(ap, fmt);
-	(void)vasprintf(&t->desc, fmt, ap);
+	if (vasprintf(&t->desc, fmt, ap) < 0)
+		err(1, "vasprintf()");
 	va_end(ap);
 	t->arg = arg;
 	t_grow(1);