diff --git a/util/valgrind-suppressions b/util/valgrind-suppressions
--- a/util/valgrind-suppressions
+++ b/util/valgrind-suppressions
@@ -109,5 +109,15 @@
    Memcheck:Value16
    fun:PyObject_Realloc
 }
-
-
+{
+   STL optimization
+   Memcheck:Value8
+   fun:_ZN9__gnu_cxx9hashtableISt4pairIKN6X86ISA11ExtMachInstE13StaticInstPtrES3_NS_4hashIS3_EESt10_Select1stIS6_ESt8equal_toIS3_ESaIS5_EE14find_or_insertERKS6_
+   fun:_ZN9__gnu_cxx8hash_mapIN6X86ISA11ExtMachInstE13StaticInstPtrNS_4hashIS2_EESt8equal_toIS2_ESaIS3_EEixERKS2_
+}
+{
+   STL optimization
+   Memcheck:Value8
+   fun:_ZN9__gnu_cxx9hashtableISt4pairIKN6X86ISA11ExtMachInstE13StaticInstPtrES3_NS_4hashIS3_EESt10_Select1stIS6_ESt8equal_toIS3_ESaIS5_EE4findERS4_
+   fun:_ZN9__gnu_cxx8hash_mapIN6X86ISA11ExtMachInstE13StaticInstPtrNS_4hashIS2_EESt8equal_toIS2_ESaIS3_EE4findERKS2_
+}