diff --git a/external/tests/test_fortran/babel.toml b/external/tests/test_fortran/babel.toml
index 60c816b9..9f1f0398 100644
--- a/external/tests/test_fortran/babel.toml
+++ b/external/tests/test_fortran/babel.toml
@@ -15,7 +15,11 @@ extra_compile_args = []
 
 [package]
 name = "pymt_heatf"
-requirements = [""]
+requirements = [
+    "bmif",
+    "heatf",
+    "bmiheatf",
+]
 
 [info]
 github_username = "pymt-lab"