diff --git a/configure.ac b/configure.ac
index ab079fc05..ceeefea5b 100644
--- a/configure.ac
+++ b/configure.ac
@@ -77,7 +77,7 @@ GTK_DOC_CHECK([1.15],[--flavour no-tmpl])
 ])
 
 # Functions and headers
-AC_CHECK_FUNCS(atexit mprotect sysconf getpagesize mmap isatty newlocale strtod_l)
+AC_CHECK_FUNCS(atexit mprotect sysconf getpagesize mmap isatty newlocale strtod_l roundf)
 AC_CHECK_HEADERS(unistd.h sys/mman.h xlocale.h stdbool.h)
 
 # Compiler flags