diff --git a/svf/lib/SVFIR/SVFValue.cpp b/svf/lib/SVFIR/SVFValue.cpp
index d7b8d1d81..b885b9f1b 100644
--- a/svf/lib/SVFIR/SVFValue.cpp
+++ b/svf/lib/SVFIR/SVFValue.cpp
@@ -1,16 +1,10 @@
 #include "SVFIR/SVFValue.h"
 #include "Util/SVFUtil.h"
+#include "Graphs/GenericGraph.h"
 
 using namespace SVF;
 using namespace SVFUtil;
 
-__attribute__((weak))
-std::string SVFValue::toString() const
-{
-    assert("SVFValue::toString should be implemented or supported by fronted" && false);
-    abort();
-}
-
 /// Add field (index and offset) with its corresponding type
 void StInfo::addFldWithType(u32_t fldIdx, const SVFType* type, u32_t elemIdx)
 {
@@ -274,3 +268,17 @@ SVFInstruction::SVFInstruction(const SVFType* ty, const SVFBasicBlock* b,
     : SVFValue(ty, k), bb(b), terminator(tm), ret(isRet)
 {
 }
+
+__attribute__((weak))
+std::string SVFValue::toString() const
+{
+    assert("SVFValue::toString should be implemented or supported by fronted" && false);
+    abort();
+}
+
+__attribute__((weak))
+const std::string SVFBaseNode::valueOnlyToString() const
+{
+    assert("SVFBaseNode::valueOnlyToString should be implemented or supported by fronted" && false);
+    abort();
+}
\ No newline at end of file
diff --git a/svf/lib/Util/SVFUtil.cpp b/svf/lib/Util/SVFUtil.cpp
index 46cf5281f..f9cb3afd8 100644
--- a/svf/lib/Util/SVFUtil.cpp
+++ b/svf/lib/Util/SVFUtil.cpp
@@ -396,11 +396,4 @@ bool SVFUtil::isRetInstNode(const ICFGNode* node)
 bool SVFUtil::isProgExitCall(const CallICFGNode* cs)
 {
     return isProgExitFunction(cs->getCalledFunction());
-}
-
-__attribute__((weak))
-const std::string SVFBaseNode::valueOnlyToString() const
-{
-    assert("SVFBaseNode::valueOnlyToString should be implemented or supported by fronted" && false);
-    abort();
 }
\ No newline at end of file