diff --git a/src/stars/GEAR/stars_io.h b/src/stars/GEAR/stars_io.h
index 7a1ed1fddda4aad485a3e2525b016de535490326..9fd2d329fc2243cbe93c73b3eea4412bfdbc246b 100644
--- a/src/stars/GEAR/stars_io.h
+++ b/src/stars/GEAR/stars_io.h
@@ -132,7 +132,7 @@ INLINE static void stars_write_particles(const struct spart *sparts,
                            sparts, id, "Unique IDs of the particles");
 
   list[4] = io_make_output_field(
-      "SmoothingLength", FLOAT, 1, UNIT_CONV_LENGTH, 1.f, sparts, h,
+      "SmoothingLengths", FLOAT, 1, UNIT_CONV_LENGTH, 1.f, sparts, h,
       "Co-moving smoothing lengths (FWHM of the kernel) of the particles");
 
   if (with_cosmology) {