diff --git a/tests/Makefile b/tests/Makefile
index d1d5ed9..dcbd066 100644
--- a/tests/Makefile
+++ b/tests/Makefile
@@ -17,7 +17,6 @@
 LOCAL_CFLAGS += -Werror -DRECORD_PSA_STATUS_COVERAGE_LOG
 endif
 
-.PHONY: generated_files
 GENERATED_BIGNUM_DATA_FILES := $(patsubst tests/%,%,$(shell \
 	$(PYTHON) ../framework/scripts/generate_bignum_tests.py --list || \
 	echo FAILED \
@@ -25,6 +24,8 @@
 ifeq ($(GENERATED_BIGNUM_DATA_FILES),FAILED)
 $(error "$(PYTHON) ../framework/scripts/generate_bignum_tests.py --list" failed)
 endif
+GENERATED_DATA_FILES += $(GENERATED_BIGNUM_DATA_FILES)
+
 GENERATED_ECP_DATA_FILES := $(patsubst tests/%,%,$(shell \
 	$(PYTHON) ../framework/scripts/generate_ecp_tests.py --list || \
 	echo FAILED \
@@ -32,6 +33,8 @@
 ifeq ($(GENERATED_ECP_DATA_FILES),FAILED)
 $(error "$(PYTHON) ../framework/scripts/generate_ecp_tests.py --list" failed)
 endif
+GENERATED_DATA_FILES += $(GENERATED_ECP_DATA_FILES)
+
 GENERATED_PSA_DATA_FILES := $(patsubst tests/%,%,$(shell \
 	$(PYTHON) ../framework/scripts/generate_psa_tests.py --list || \
 	echo FAILED \
@@ -39,8 +42,13 @@
 ifeq ($(GENERATED_PSA_DATA_FILES),FAILED)
 $(error "$(PYTHON) ../framework/scripts/generate_psa_tests.py --list" failed)
 endif
-GENERATED_FILES := $(GENERATED_PSA_DATA_FILES) $(GENERATED_ECP_DATA_FILES) $(GENERATED_BIGNUM_DATA_FILES)
-generated_files: $(GENERATED_FILES) src/test_keys.h src/test_certs.h
+GENERATED_DATA_FILES += $(GENERATED_PSA_DATA_FILES)
+
+GENERATED_FILES = $(GENERATED_DATA_FILES)
+GENERATED_FILES += src/test_keys.h src/test_certs.h
+
+.PHONY: generated_files
+generated_files: $(GENERATED_FILES)
 
 # generate_bignum_tests.py and generate_psa_tests.py spend more time analyzing
 # inputs than generating outputs. Its inputs are the same no matter which files
@@ -48,7 +56,6 @@
 # It's rare not to want all the outputs. So always generate all of its outputs.
 # Use an intermediate phony dependency so that parallel builds don't run
 # a separate instance of the recipe for each output file.
-.SECONDARY: generated_bignum_test_data generated_ecp_test_data generated_psa_test_data
 $(GENERATED_BIGNUM_DATA_FILES): $(gen_file_dep) generated_bignum_test_data
 generated_bignum_test_data: ../framework/scripts/generate_bignum_tests.py
 generated_bignum_test_data: ../framework/scripts/mbedtls_framework/bignum_common.py
@@ -60,6 +67,7 @@
 generated_bignum_test_data:
 	echo "  Gen   $(GENERATED_BIGNUM_DATA_FILES)"
 	$(PYTHON) ../framework/scripts/generate_bignum_tests.py
+.SECONDARY: generated_bignum_test_data
 
 $(GENERATED_ECP_DATA_FILES): $(gen_file_dep) generated_ecp_test_data
 generated_ecp_test_data: ../framework/scripts/generate_ecp_tests.py
@@ -70,6 +78,7 @@
 generated_ecp_test_data:
 	echo "  Gen   $(GENERATED_ECP_DATA_FILES)"
 	$(PYTHON) ../framework/scripts/generate_ecp_tests.py
+.SECONDARY: generated_ecp_test_data
 
 $(GENERATED_PSA_DATA_FILES): $(gen_file_dep) generated_psa_test_data
 generated_psa_test_data: ../framework/scripts/generate_psa_tests.py
@@ -92,6 +101,7 @@
 generated_psa_test_data:
 	echo "  Gen   $(GENERATED_PSA_DATA_FILES) ..."
 	$(PYTHON) ../framework/scripts/generate_psa_tests.py
+.SECONDARY: generated_psa_test_data
 
 # A test application is built for each suites/test_suite_*.data file.
 # Application name is same as .data file's base name and can be
@@ -99,7 +109,7 @@
 DATA_FILES := $(wildcard suites/test_suite_*.data)
 # Make sure that generated data files are included even if they don't
 # exist yet when the makefile is parsed.
-DATA_FILES += $(filter-out $(DATA_FILES),$(GENERATED_FILES))
+DATA_FILES += $(filter-out $(DATA_FILES),$(GENERATED_DATA_FILES))
 APPS = $(basename $(subst suites/,,$(DATA_FILES)))
 
 # Construct executable name by adding OS specific suffix $(EXEXT).