diff --git a/radiation/Makefile b/radiation/Makefile
index 59f5fbde..086ee279 100644
--- a/radiation/Makefile
+++ b/radiation/Makefile
@@ -69,7 +69,7 @@ radiation_single_level.o: radiation_config.o
 radiation_monochromatic.o radiation_aerosol_optics.o radiation_cloud_optics.o \
 	radiation_homogeneous_sw.o radiation_spartacus_lw.o \
 	radiation_cloudless_sw.o radiation_cloudless_lw.o \
-	radiation_ecckd.o radiation_flux.o \
+	radiation_ecckd.o radiation_flux.o radiation_spectral_definition.o \
 	radiation_spartacus_sw.o radiation_thermodynamics.o: radiation_constants.o
 radiation_cloud_optics.o radiation_config.o: \
 	radiation_cloud_optics_data.o
@@ -111,4 +111,6 @@ radiation_general_cloud_optics_data.o: radiation_spectral_definition.o
 
 radiation_general_cloud_optics.o: radiation_config.o radiation_cloud.o radiation_thermodynamics.o radiation_constants.o
 
+radiation_aerosol_optics.o: radiation_aerosol.o
+
 *.o: ecrad_config.h