diff --git a/Makefile b/Makefile
index 4c77e7f6..44d53d92 100644
--- a/Makefile
+++ b/Makefile
@@ -17,7 +17,7 @@ endif
 bin/functest_$(subst /,_,$(SCHEME)): test/$(dir $(SCHEME))functest.c $(wildcard $(SCHEME)/clean/*.c) $(wildcard $(SCHEME)/clean/*.h) | require_scheme
 	mkdir -p bin
 	$(CC) $(CFLAGS) \
-		-DPQCLEAN_NAMESPACE=$(shell echo PQCLEAN_$(subst -,,$(notdir $(SCHEME))) | tr a-z A-Z) \
+		-DPQCLEAN_NAMESPACE=$(shell echo PQCLEAN_$(subst -,,$(notdir $(SCHEME)))_CLEAN | tr a-z A-Z) \
 		-iquote "./common/" \
 		-iquote "$(SCHEME)/clean/" \
 		-o bin/functest_$(subst /,_,$(SCHEME)) \
@@ -44,7 +44,7 @@ endif
 bin/sanitizer_$(subst /,_,$(SCHEME)): test/$(dir $(SCHEME))functest.c $(wildcard $(SCHEME)/clean/*.c) $(wildcard $(SCHEME)/clean/*.h) | require_scheme
 	mkdir -p bin
 	$(CC) $(CFLAGS) -fsanitize=address,undefined \
-		-DPQCLEAN_NAMESPACE=$(shell echo PQCLEAN_$(subst -,,$(notdir $(SCHEME))) | tr a-z A-Z) \
+		-DPQCLEAN_NAMESPACE=$(shell echo PQCLEAN_$(subst -,,$(notdir $(SCHEME)))_CLEAN | tr a-z A-Z) \
 		-iquote "./common/" \
 		-iquote "$(SCHEME)/clean/" \
 		-o bin/sanitizer_$(subst /,_,$(SCHEME)) \
@@ -59,7 +59,7 @@ sanitizer: bin/sanitizer_$(subst /,_,$(SCHEME))
 bin/shared_$(subst /,_,$(SCHEME))_clean.so: $(wildcard $(SCHEME)/clean/*.c) | require_scheme
 	mkdir -p bin
 	$(CC) $(CFLAGS) \
-		-DPQCLEAN_NAMESPACE=$(shell echo PQCLEAN_$(subst -,,$(notdir $(SCHEME))) | tr a-z A-Z) \
+		-DPQCLEAN_NAMESPACE=$(shell echo PQCLEAN_$(subst -,,$(notdir $(SCHEME)))_CLEAN | tr a-z A-Z) \
 		-nostdlib \
 		-shared \
 		-fPIC \
diff --git a/test/Makefile.Microsoft_nmake b/test/Makefile.Microsoft_nmake
index bf86a0cc..afc082c2 100644
--- a/test/Makefile.Microsoft_nmake
+++ b/test/Makefile.Microsoft_nmake
@@ -6,6 +6,7 @@ TYPE=kem
 SCHEME=kyber768
 SCHEME_UPPERCASE=KYBER768
 IMPLEMENTATION=clean
+IMPLEMENTATION_UPPERCASE=CLEAN
 
 SCHEME_DIR=..\crypto_$(TYPE)\$(SCHEME)\$(IMPLEMENTATION)
 
@@ -27,12 +28,12 @@ rebuild-scheme:
 
 $(DEST_DIR)\functest_$(SCHEME)_$(IMPLEMENTATION).EXE: rebuild-scheme $(COMMON_OBJECTS) $(COMMON_DIR)\randombytes.obj
     -MKDIR $(DEST_DIR)
-    $(CC) /c crypto_$(TYPE)\functest.c $(CFLAGS) /I $(SCHEME_DIR) /DPQCLEAN_NAMESPACE=PQCLEAN_$(SCHEME_UPPERCASE)
+    $(CC) /c crypto_$(TYPE)\functest.c $(CFLAGS) /I $(SCHEME_DIR) /DPQCLEAN_NAMESPACE=PQCLEAN_$(SCHEME_UPPERCASE)_$(IMPLEMENTATION_UPPERCASE)
     LINK.EXE /OUT:$@ functest.obj $(COMMON_OBJECTS_NOPATH) randombytes.obj $(SCHEME_DIR)\lib$(SCHEME)_$(IMPLEMENTATION).lib Advapi32.lib
 
 $(DEST_DIR)\testvectors_$(SCHEME)_$(IMPLEMENTATION).EXE: rebuild-scheme $(COMMON_OBJECTS) $(COMMON_DIR)\notrandombytes.obj
     -MKDIR $(DEST_DIR)
-    $(CC) /c crypto_$(TYPE)\testvectors.c $(CFLAGS) /I $(SCHEME_DIR) /DPQCLEAN_NAMESPACE=PQCLEAN_$(SCHEME_UPPERCASE)
+    $(CC) /c crypto_$(TYPE)\testvectors.c $(CFLAGS) /I $(SCHEME_DIR) /DPQCLEAN_NAMESPACE=PQCLEAN_$(SCHEME_UPPERCASE)_$(IMPLEMENTATION_UPPERCASE)
     LINK.EXE /OUT:$@ testvectors.obj $(COMMON_OBJECTS_NOPATH) notrandombytes.obj $(SCHEME_DIR)\lib$(SCHEME)_$(IMPLEMENTATION).lib
 
 clean: