diff --git a/altsrc/flag.go b/altsrc/flag.go
index 31b8a04e87..bb3c347788 100644
--- a/altsrc/flag.go
+++ b/altsrc/flag.go
@@ -197,10 +197,8 @@ func (f *IntFlag) ApplyInputSourceValue(context *cli.Context, isc InputSourceCon
 			if err != nil {
 				return err
 			}
-			if value > 0 {
-				for _, name := range f.Names() {
-					_ = f.set.Set(name, strconv.FormatInt(int64(value), 10))
-				}
+			for _, name := range f.Names() {
+				_ = f.set.Set(name, strconv.FormatInt(int64(value), 10))
 			}
 		}
 	}
@@ -215,10 +213,8 @@ func (f *DurationFlag) ApplyInputSourceValue(context *cli.Context, isc InputSour
 			if err != nil {
 				return err
 			}
-			if value > 0 {
-				for _, name := range f.Names() {
-					_ = f.set.Set(name, value.String())
-				}
+			for _, name := range f.Names() {
+				_ = f.set.Set(name, value.String())
 			}
 		}
 	}
@@ -233,11 +229,9 @@ func (f *Float64Flag) ApplyInputSourceValue(context *cli.Context, isc InputSourc
 			if err != nil {
 				return err
 			}
-			if value > 0 {
-				floatStr := float64ToString(value)
-				for _, name := range f.Names() {
-					_ = f.set.Set(name, floatStr)
-				}
+			floatStr := float64ToString(value)
+			for _, name := range f.Names() {
+				_ = f.set.Set(name, floatStr)
 			}
 		}
 	}
diff --git a/altsrc/flag_test.go b/altsrc/flag_test.go
index 204833118f..e20ab02b6e 100644
--- a/altsrc/flag_test.go
+++ b/altsrc/flag_test.go
@@ -234,6 +234,15 @@ func TestIntApplyInputSourceMethodSet(t *testing.T) {
 	expect(t, 15, c.Int("test"))
 }
 
+func TestIntApplyInputSourceMethodSetNegativeValue(t *testing.T) {
+	c := runTest(t, testApplyInputSource{
+		Flag:     NewIntFlag(&cli.IntFlag{Name: "test"}),
+		FlagName: "test",
+		MapValue: -1,
+	})
+	expect(t, -1, c.Int("test"))
+}
+
 func TestIntApplyInputSourceMethodContextSet(t *testing.T) {
 	c := runTest(t, testApplyInputSource{
 		Flag:               NewIntFlag(&cli.IntFlag{Name: "test"}),
@@ -264,6 +273,15 @@ func TestDurationApplyInputSourceMethodSet(t *testing.T) {
 	expect(t, 30*time.Second, c.Duration("test"))
 }
 
+func TestDurationApplyInputSourceMethodSetNegativeValue(t *testing.T) {
+	c := runTest(t, testApplyInputSource{
+		Flag:     NewDurationFlag(&cli.DurationFlag{Name: "test"}),
+		FlagName: "test",
+		MapValue: -30 * time.Second,
+	})
+	expect(t, -30*time.Second, c.Duration("test"))
+}
+
 func TestDurationApplyInputSourceMethodContextSet(t *testing.T) {
 	c := runTest(t, testApplyInputSource{
 		Flag:               NewDurationFlag(&cli.DurationFlag{Name: "test"}),
@@ -294,6 +312,15 @@ func TestFloat64ApplyInputSourceMethodSet(t *testing.T) {
 	expect(t, 1.3, c.Float64("test"))
 }
 
+func TestFloat64ApplyInputSourceMethodSetNegativeValue(t *testing.T) {
+	c := runTest(t, testApplyInputSource{
+		Flag:     NewFloat64Flag(&cli.Float64Flag{Name: "test"}),
+		FlagName: "test",
+		MapValue: -1.3,
+	})
+	expect(t, -1.3, c.Float64("test"))
+}
+
 func TestFloat64ApplyInputSourceMethodContextSet(t *testing.T) {
 	c := runTest(t, testApplyInputSource{
 		Flag:               NewFloat64Flag(&cli.Float64Flag{Name: "test"}),