diff --git a/data/indicator_coefficient_importer/Makefile b/data/indicator_coefficient_importer/Makefile
index 229850e131..2191d83f15 100644
--- a/data/indicator_coefficient_importer/Makefile
+++ b/data/indicator_coefficient_importer/Makefile
@@ -1,5 +1,7 @@
-all: blue-water-indicator-coefficients
+all: blue-water-indicator-coefficients grey-water-indicator-coefficients
 
 blue-water-indicator-coefficients:
 	python indicator_coefficient_importer.py data/bwfp_indicator_coefficients.csv UWU 2005
 
+grey-water-indicator-coefficients:
+	python indicator_coefficient_importer.py data/gwfp_indicator_coefficients.csv NL 2005