diff --git a/packages/maemo-strongswan/debian/patches/llabs-needs-c99.patch b/packages/maemo-strongswan/debian/patches/llabs-needs-c99.patch
new file mode 100644
index 000000000..25aced4a6
--- /dev/null
+++ b/packages/maemo-strongswan/debian/patches/llabs-needs-c99.patch
@@ -0,0 +1,13 @@
+llabs is defined in C99. features.h on other platforms enables C99 features
+automatically, here we explicitly enable them with _GNU_SOURCE (which enables
+also a lot of other things).
+--- a/src/libstrongswan/utils.c
++++ b/src/libstrongswan/utils.c
+@@ -14,6 +14,7 @@
+  * for more details.
+  */
+ 
++#define _GNU_SOURCE
+ #include "utils.h"
+ 
+ #include <sys/stat.h>
diff --git a/packages/maemo-strongswan/debian/patches/series b/packages/maemo-strongswan/debian/patches/series
index 7f11cae60..16a3af5ca 100644
--- a/packages/maemo-strongswan/debian/patches/series
+++ b/packages/maemo-strongswan/debian/patches/series
@@ -1,2 +1,3 @@
 shorter-timeout.patch
 configure-logging.patch
+llabs-needs-c99.patch