diff --git a/trunk/src/com/jpexs/decompiler/flash/SWFOutputStream.java b/trunk/src/com/jpexs/decompiler/flash/SWFOutputStream.java
index 3f7ae4f70..44e380dab 100644
--- a/trunk/src/com/jpexs/decompiler/flash/SWFOutputStream.java
+++ b/trunk/src/com/jpexs/decompiler/flash/SWFOutputStream.java
@@ -343,17 +343,31 @@ public class SWFOutputStream extends OutputStream {
      */
     public void writeRECT(RECT value) throws IOException {
         int nBits = 0;
-        nBits = enlargeBitCountS(nBits, value.Xmin);
-        nBits = enlargeBitCountS(nBits, value.Xmax);
-        nBits = enlargeBitCountS(nBits, value.Ymin);
-        nBits = enlargeBitCountS(nBits, value.Ymax);
+        int xMin = truncateTo31Bit(value.Xmin);
+        int xMax = truncateTo31Bit(value.Xmax);
+        int yMin = truncateTo31Bit(value.Ymin);
+        int yMax = truncateTo31Bit(value.Ymax);
+        nBits = enlargeBitCountS(nBits, xMin);
+        nBits = enlargeBitCountS(nBits, xMax);
+        nBits = enlargeBitCountS(nBits, yMin);
+        nBits = enlargeBitCountS(nBits, yMax);
         writeUB(5, nBits);
-        writeSB(nBits, value.Xmin);
-        writeSB(nBits, value.Xmax);
-        writeSB(nBits, value.Ymin);
-        writeSB(nBits, value.Ymax);
+        writeSB(nBits, xMin);
+        writeSB(nBits, xMax);
+        writeSB(nBits, yMin);
+        writeSB(nBits, yMax);
         alignByte();
     }
+    
+    private int truncateTo31Bit(int value) {
+        if (value > 0x3fffffff) {
+            value = 0x3fffffff;
+        }
+        if (value < -0x3fffffff) {
+            value = -0x3fffffff;
+        }
+        return value;
+    }
 
     /**
      * Writes list of Tag values to the stream
diff --git a/trunk/test/com/jpexs/decompiler/flash/SWFStreamTest.java b/trunk/test/com/jpexs/decompiler/flash/SWFStreamTest.java
index 6df586d75..bf4f55197 100644
--- a/trunk/test/com/jpexs/decompiler/flash/SWFStreamTest.java
+++ b/trunk/test/com/jpexs/decompiler/flash/SWFStreamTest.java
@@ -1,5 +1,6 @@
 package com.jpexs.decompiler.flash;
 
+import com.jpexs.decompiler.flash.types.RECT;
 import java.io.ByteArrayInputStream;
 import java.io.ByteArrayOutputStream;
 import java.io.IOException;
@@ -139,4 +140,22 @@ public class SWFStreamTest {
         assertEquals(ff, sis.readFIXED8());
         sis.close();
     }
+    
+    @Test
+    public void testRECT() throws IOException {
+        RECT rect;
+        ByteArrayOutputStream baos = new ByteArrayOutputStream();
+        try (SWFOutputStream sos = new SWFOutputStream(baos, 10)) {
+            rect = new RECT(-0x80000000, 0x7FFFFFFF, -0x80000000, 0x7FFFFFFF);
+            sos.writeRECT(rect);
+        }
+        ByteArrayInputStream bais = new ByteArrayInputStream(baos.toByteArray());
+        try (SWFInputStream sis = new SWFInputStream(bais, 10)) {
+            RECT readRECT = sis.readRECT();
+            assertEquals(readRECT.Xmin, -0x3FFFFFFF);
+            assertEquals(readRECT.Xmax, 0x3FFFFFFF);
+            assertEquals(readRECT.Ymin, -0x3FFFFFFF);
+            assertEquals(readRECT.Ymax, 0x3FFFFFFF);
+        }
+    }
 }