diff --git a/client/tinycbor/cborinternal_p.h b/client/tinycbor/cborinternal_p.h
index 8609ce2ad..65c42cdf4 100644
--- a/client/tinycbor/cborinternal_p.h
+++ b/client/tinycbor/cborinternal_p.h
@@ -87,7 +87,7 @@ static inline double decode_half(unsigned short half) {
     if (exp == 0) val = ldexp(mant, -24);
     else if (exp != 31) val = ldexp(mant + 1024, exp - 25);
     else val = mant == 0 ? INFINITY : NAN;
-    return half & 0x8000 ? -val : val;
+    return (half & 0x8000) ? -val : val;
 }
 #  endif
 #endif /* CBOR_NO_HALF_FLOAT_TYPE */