diff --git a/test/valgrind.supp b/test/valgrind.supp
index c9d3d226..63af7bf9 100644
--- a/test/valgrind.supp
+++ b/test/valgrind.supp
@@ -24,3 +24,31 @@
    fun:*Uri*Parse_UTF16_Std*
 }
 
+{
+   Suppress memcpy_chk valgrind report 5
+   Memcheck:Overlap
+   fun:__memcpy_chk
+   fun:*dtoa_normal*
+}
+
+{
+   Suppress memcpy_chk valgrind report 6
+   Memcheck:Overlap
+   fun:__memcpy_chk
+   fun:*dtoa_maxDecimalPlaces*
+}
+
+{
+   Suppress memcpy_chk valgrind report 7
+   Memcheck:Overlap
+   fun:__memcpy_chk
+   ...
+   fun:*Reader*ParseDoubleHandler*
+}
+
+{
+   Suppress memcpy_chk valgrind report 8
+   Memcheck:Overlap
+   fun:__memcpy_chk
+   fun:*Reader*ParseNumber_NormalPrecisionError*
+}