diff --git a/addons/misra.py b/addons/misra.py
index f5b4532c8..af7c71241 100755
--- a/addons/misra.py
+++ b/addons/misra.py
@@ -2265,7 +2265,8 @@ class MisraChecker:
                     e = getEssentialType(token.astOperand2)
                 if not e:
                     continue
-                if bitsOfEssentialType(vt1.type) > bitsOfEssentialType(e):
+                lhsbits = vt1.bits if vt1.bits else bitsOfEssentialType(vt1.type)
+                if lhsbits > bitsOfEssentialType(e):
                     self.reportError(token, 10, 6)
             except ValueError:
                 pass
diff --git a/addons/test/misra/misra-test.c b/addons/test/misra/misra-test.c
index 920818531..807412a45 100644
--- a/addons/test/misra/misra-test.c
+++ b/addons/test/misra/misra-test.c
@@ -707,11 +707,16 @@ static void misra_10_5(uint16_t x) {
     res = (float) 'x';
 }
 
+struct misra_10_6_s {
+    unsigned int a:4;
+};
 static void misra_10_6(u8 x, u32 a, u32 b, char c1, char c2) {
   u16 y = x+x; // 10.6
   u16 z = ~u8 x ;//10.6
   u32 c = ( u16) ( u32 a + u32 b ); //10.6
   s32 i = c1 - c2; // 10.3 FIXME: False positive for 10.6 (this is compliant). Trac #9488
+  struct misra_10_6_s s;
+  s.a = x & 1U; // no-warning (#10487)
 }
 static void misra_10_6_1(uint32_t *a, uint16_t b, uint16_t c)
 {