diff --git a/CHANGELOG b/CHANGELOG
index 1e9d50451..6f054c577 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -1,5 +1,10 @@
 Changes to version 1.3.1
 ------------------------
+- GOOSE publisher: fixed problem in payload length calculation
+- .NET API: Added method MmsConnection.ReadMultipleVariables
+- IEC 61850 client: implemented tissue 1178 client side (select-response+ is
+non-NULL)
+- SV publisher: fixed RefrTm and SmpSynch handling
 - IEC 61850 client: improved support for handling segmented reports
 - .NET API: Added some additional access function to ReportControlBlock
 - Java SCL parser: added support for timestamp values in "Val" elements
diff --git a/examples/iec61850_9_2_LE_example/iec61850_9_2_LE_example.c b/examples/iec61850_9_2_LE_example/iec61850_9_2_LE_example.c
index 259736f6a..ccfaa2e98 100644
--- a/examples/iec61850_9_2_LE_example/iec61850_9_2_LE_example.c
+++ b/examples/iec61850_9_2_LE_example/iec61850_9_2_LE_example.c
@@ -27,6 +27,7 @@
 #include <signal.h>
 #include <stdlib.h>
 #include <stdio.h>
+#define _USE_MATH_DEFINES
 #include <math.h>
 
 /* Include the generated header with the model access handles */