diff --git a/test/Makefile b/test/Makefile
index 43966398..30a0af29 100644
--- a/test/Makefile
+++ b/test/Makefile
@@ -20,6 +20,9 @@ CFLAGS=-O3 -Wall -Wextra -Wpedantic -Werror -std=c99 \
 	   -fstrict-aliasing -fno-common -pipe \
 	   -I$(COMMON_DIR) $(EXTRAFLAGS)
 
+# Number of tests run for functests
+NTESTS=1
+
 all: $(DEST_DIR)/functest_$(SCHEME)_$(IMPLEMENTATION) \
 	$(DEST_DIR)/testvectors_$(SCHEME)_$(IMPLEMENTATION) \
 	$(DEST_DIR)/printparams_$(SCHEME)_$(IMPLEMENTATION)
@@ -50,7 +53,7 @@ $(DEST_DIR)/test_common_%: common/%.c $(COMMON_FILES)
 
 $(DEST_DIR)/functest_$(SCHEME)_$(IMPLEMENTATION): build-scheme crypto_$(TYPE)/functest.c $(COMMON_FILES) $(COMMON_DIR)/randombytes.c $(COMMON_HEADERS)
 	mkdir -p $(DEST_DIR)
-	$(CC) $(CFLAGS) -DPQCLEAN_NAMESPACE=PQCLEAN_$(SCHEME_UPPERCASE)_$(IMPLEMENTATION_UPPERCASE) -I$(SCHEME_DIR) crypto_$(TYPE)/functest.c $(COMMON_FILES) $(COMMON_DIR)/notrandombytes.c -o $@ -L$(SCHEME_DIR) -l$(SCHEME)_$(IMPLEMENTATION)
+	$(CC) $(CFLAGS) -DNTESTS=$(NTESTS) -DPQCLEAN_NAMESPACE=PQCLEAN_$(SCHEME_UPPERCASE)_$(IMPLEMENTATION_UPPERCASE) -I$(SCHEME_DIR) crypto_$(TYPE)/functest.c $(COMMON_FILES) $(COMMON_DIR)/notrandombytes.c -o $@ -L$(SCHEME_DIR) -l$(SCHEME)_$(IMPLEMENTATION)
 
 $(DEST_DIR)/testvectors_$(SCHEME)_$(IMPLEMENTATION): build-scheme crypto_$(TYPE)/testvectors.c $(COMMON_FILES) $(COMMON_DIR)/notrandombytes.c $(COMMON_HEADERS)
 	mkdir -p $(DEST_DIR)
diff --git a/test/crypto_kem/functest.c b/test/crypto_kem/functest.c
index fcc34fd1..8e131e07 100644
--- a/test/crypto_kem/functest.c
+++ b/test/crypto_kem/functest.c
@@ -5,7 +5,9 @@
 #include "api.h"
 #include "randombytes.h"
 
+#ifndef NTESTS
 #define NTESTS 5
+#endif
 
 const uint8_t canary[8] = {
     0x01, 0x23, 0x45, 0x67, 0x89, 0xAB, 0xCD, 0xEF
diff --git a/test/crypto_sign/functest.c b/test/crypto_sign/functest.c
index baef6035..bd729194 100644
--- a/test/crypto_sign/functest.c
+++ b/test/crypto_sign/functest.c
@@ -6,7 +6,10 @@
 #include "api.h"
 #include "randombytes.h"
 
+#ifndef NTESTS
 #define NTESTS 5
+#endif
+
 #define MLEN 32
 
 const uint8_t canary[8] = {