diff --git a/pkg/io/size.go b/pkg/io/size.go
index 3075a77db..9ee40eeba 100644
--- a/pkg/io/size.go
+++ b/pkg/io/size.go
@@ -59,7 +59,7 @@ func GetVarSize(value interface{}) int {
 	case reflect.Ptr:
 		vser, ok := v.Interface().(Serializable)
 		if !ok {
-			panic(fmt.Sprintf("unable to calculate GetVarSize for a non-Serializable pointer"))
+			panic("unable to calculate GetVarSize for a non-Serializable pointer")
 		}
 		cw := counterWriter{}
 		w := NewBinWriterFromIO(&cw)
diff --git a/pkg/vm/cli/cli_test.go b/pkg/vm/cli/cli_test.go
index 477e996ec..7eb4a2abd 100644
--- a/pkg/vm/cli/cli_test.go
+++ b/pkg/vm/cli/cli_test.go
@@ -324,7 +324,7 @@ func TestLoadAbort(t *testing.T) {
 		"run",
 	)
 
-	e.checkNextLine(t, fmt.Sprintf("READY: loaded 2 instructions"))
+	e.checkNextLine(t, "READY: loaded 2 instructions")
 	e.checkNextLine(t, "Error:.*at instruction 1.*ABORT")
 }
 
@@ -349,7 +349,7 @@ func TestBreakpoint(t *testing.T) {
 	e.checkNextLine(t, "no program loaded")
 	e.checkNextLine(t, "no program loaded")
 	e.checkNextLine(t, "no program loaded")
-	e.checkNextLine(t, fmt.Sprintf("READY: loaded 5 instructions"))
+	e.checkNextLine(t, "READY: loaded 5 instructions")
 	e.checkError(t, ErrMissingParameter)
 	e.checkError(t, ErrInvalidParameter)
 	e.checkNextLine(t, "breakpoint added at instruction 2")
@@ -415,19 +415,19 @@ func TestStepIntoOverOut(t *testing.T) {
 		"loadhex "+script,
 		"step", "stepinto", "stepout", "run")
 
-	e.checkNextLine(t, fmt.Sprintf("READY: loaded \\d+ instructions"))
+	e.checkNextLine(t, "READY: loaded 8 instructions")
 	e.checkNextLine(t, "at breakpoint 1.*CALL")
 	e.checkNextLine(t, "instruction pointer at.*NOP")
 	e.checkStack(t, 5)
 
-	e.checkNextLine(t, fmt.Sprintf("READY: loaded \\d+ instructions"))
+	e.checkNextLine(t, "READY: loaded 8 instructions")
 	e.checkNextLine(t, "at breakpoint.*CALL")
 	e.checkNextLine(t, "instruction pointer at.*PUSH3")
 	e.checkNextLine(t, "at breakpoint.*ADD")
 	e.checkStack(t, 2, 3)
 	e.checkStack(t, 5)
 
-	e.checkNextLine(t, fmt.Sprintf("READY: loaded \\d+ instructions"))
+	e.checkNextLine(t, "READY: loaded 8 instructions")
 	e.checkNextLine(t, "at breakpoint 1.*CALL")
 	e.checkNextLine(t, "instruction pointer at.*PUSH3")
 	e.checkNextLine(t, "instruction pointer at.*NOP")