diff --git a/libs/yscript/javascript.cpp b/libs/yscript/javascript.cpp
index 8b6c1515..159793d2 100644
--- a/libs/yscript/javascript.cpp
+++ b/libs/yscript/javascript.cpp
@@ -321,7 +321,7 @@ bool JsCode::link()
 	    continue;
 	long int lbl = l->number();
 	for (unsigned int j = 0; j < n; i++) {
-	    ExpOperation* jmp = static_cast<const ExpOperation*>(m_linked[j]);
+	    const ExpOperation* jmp = static_cast<const ExpOperation*>(m_linked[j]);
 	    if (!jmp || jmp->number() != lbl)
 		continue;
 	    Opcode op = OpcNone;
@@ -342,6 +342,7 @@ bool JsCode::link()
 	    m_linked.set(new ExpOperation(op,0,offs,jmp->barrier()),j);
 	}
     }
+    return true;
 }
 
 bool JsCode::keywordChar(char c) const
@@ -932,7 +933,7 @@ bool JsCode::jumpRelative(long int offset, GenObject* context) const
 	return false;
     unsigned int& index = static_cast<JsRunner*>(context)->m_index;
     long int i = index + offset;
-    if (i < 0 || i > m_linked.length())
+    if (i < 0 || i > (long int)m_linked.length())
 	return false;
     index = i;
     return true;
diff --git a/libs/yscript/script.cpp b/libs/yscript/script.cpp
index a697b958..4b9bb4e1 100644
--- a/libs/yscript/script.cpp
+++ b/libs/yscript/script.cpp
@@ -57,9 +57,9 @@ bool ScriptParser::parseFile(const char* name, bool fragment)
     int64_t len = f.length();
     if (len <= 0 || len > 65535)
 	return false;
-    DataBlock data(0,len+1);
+    DataBlock data(0,(unsigned int)len+1);
     char* text = (char*)data.data();
-    if (f.readData(text,len) != len)
+    if (f.readData(text,(int)len) != len)
 	return false;
     text[len] = '\0';
     return parse(text,fragment);
diff --git a/libs/yscript/yatescript.h b/libs/yscript/yatescript.h
index 15ff7b64..47c866b0 100644
--- a/libs/yscript/yatescript.h
+++ b/libs/yscript/yatescript.h
@@ -57,6 +57,12 @@ class ExpOperation;
 class YSCRIPT_API ExpExtender
 {
 public:
+    /**
+     * Destructor
+     */
+    virtual ~ExpExtender()
+	{ }
+
     /**
      * Retrieve the reference counted object owning this interface
      * @return Pointer to object owning the extender, NULL if no ownership