diff --git a/src/nanovg.c b/src/nanovg.c
index a9f6a07..c50657f 100644
--- a/src/nanovg.c
+++ b/src/nanovg.c
@@ -306,6 +306,12 @@ struct NVGcolor nvgTransRGBA(struct NVGcolor c, unsigned char a)
 	return c;
 }
 
+struct NVGcolor nvgTransRGBAf(struct NVGcolor c, float a)
+{
+	c.a = a;
+	return c;
+}
+
 struct NVGcolor nvgLerpRGBA(struct NVGcolor c0, struct NVGcolor c1, float u)
 {
 	int i;
diff --git a/src/nanovg.h b/src/nanovg.h
index 0767759..9233560 100644
--- a/src/nanovg.h
+++ b/src/nanovg.h
@@ -133,6 +133,9 @@ struct NVGcolor nvgLerpRGBA(struct NVGcolor c0, struct NVGcolor c1, float u);
 // Sets transparency of a color value.
 struct NVGcolor nvgTransRGBA(struct NVGcolor c0, unsigned char a);
 
+// Sets transparency of a color value.
+struct NVGcolor nvgTransRGBAf(struct NVGcolor c0, float a);
+
 // Returns color value specified by hue, saturation and lightness.
 // HSL values are all in range [0..1], alpha will be set to 255.
 struct NVGcolor nvgHSL(float h, float s, float l);