diff --git a/core/vm/arch/jit/jit_common.cpp b/core/vm/arch/jit/jit_common.cpp
index 5335e5a21b..58d62d5801 100644
--- a/core/vm/arch/jit/jit_common.cpp
+++ b/core/vm/arch/jit/jit_common.cpp
@@ -237,9 +237,9 @@ void JitCompiler::JitStackCallback(const long instr_id, StackInstr* instr, const
         conv = formatter.str();
       }
 
-      const size_t max = conv.size() < 32 ? conv.size() : 32;
+      const size_t max = str_ptr[0];
 #ifdef _WIN32
-      wcsncpy_s(str, str_ptr[0], conv.c_str(), max);
+      wcsncpy_s(str, str_ptr[0] + 1, conv.c_str(), max);
 #else
       wcsncpy(str, conv.c_str(), max);
 #endif
diff --git a/programs/tests/prgm287.obs b/programs/tests/prgm287.obs
index fa21e90eea..30e02b2073 100644
--- a/programs/tests/prgm287.obs
+++ b/programs/tests/prgm287.obs
@@ -1,18 +1,5 @@
 class Test {
 	function : Main(args : String[]) ~ Nil {
-		str := "𤭢";
-		System.IO.Standard->SetIntFormat(System.Number->Format->HEX);
-		u8str := str->ToByteArray();
-		each(b in u8str) {
-			b->ToHexString()->Print();
-			" "->Print();
-		}
-		""->PrintLine();
-		u16str := str->ToCharArray();
-		each(i in u16str) {
-			c : Int := i;
-			c->Print();
-			" "->Print();
-		}
+		-1->ToHexString()->Print();
 	}
 }
\ No newline at end of file