diff --git a/build.xml b/build.xml
index a1353b814..2a595dd72 100644
--- a/build.xml
+++ b/build.xml
@@ -394,6 +394,7 @@
                     <runtimeBits>64/32</runtimeBits>
                     <maxHeapPercent>${max.heap.size.percent}</maxHeapPercent>
                     <opt>-Djava.net.preferIPv4Stack=true</opt>
+                    <opt>-Djna.nosys=true</opt>
                 </jre>
                 <splash>
                     <file>graphics/splash.bmp</file>
diff --git a/resources/ffdec.bat b/resources/ffdec.bat
index 0fe576e59..73c00f562 100644
--- a/resources/ffdec.bat
+++ b/resources/ffdec.bat
@@ -1,2 +1,2 @@
 @echo off
-java -Xmx1024m -jar "%~dp0\ffdec.jar" %*
\ No newline at end of file
+java -Xmx1024m -Djna.nosys=true -jar "%~dp0\ffdec.jar" %*
\ No newline at end of file