diff --git a/os/hal/lib/streams/chprintf.c b/os/hal/lib/streams/chprintf.c
index 33134da96..4ecec7bcf 100644
--- a/os/hal/lib/streams/chprintf.c
+++ b/os/hal/lib/streams/chprintf.c
@@ -315,7 +315,7 @@ unsigned_common:
       width = -width;
     }
     if (width < 0) {
-      if (*s == '-' && filler == '0') {
+      if ((*s == '-' || *s == '+') && filler == '0') {
         streamPut(chp, (uint8_t)*s++);
         n++;
         i--;
diff --git a/readme.txt b/readme.txt
index 4bc848cfe..1c64d9b7a 100644
--- a/readme.txt
+++ b/readme.txt
@@ -74,6 +74,7 @@
 *****************************************************************************
 
 *** Next ***
+- FIX: Fixed chsnprintf() sign mode/filler mode conflict (bug #1140)
 - NEW: Added time conversion macros and functions for monotonic time stamps
 - NEW: Added support for STM32WB55.
 - NEW: Added chscanf() and buffered streams, contributed by Alex Lewontin.