diff --git a/makefile b/makefile
index 4a91506d..85a6a9a7 100644
--- a/makefile
+++ b/makefile
@@ -135,11 +135,11 @@ ABSDYNLIB = $(FINUFFT)$(DYNLIB)
 
 # spreader is subset of the library with self-contained testing, hence own objs:
 # double-prec spreader object files that also need single precision...
-SOBJS = src/spreadinterp.o src/utils.o
+SOBJS =
 # their single-prec versions
 SOBJSF = $(SOBJS:%.o=%_32.o)
 # precision-dependent spreader object files (compiled & linked only once)...
-SOBJS_PI = src/utils_precindep.o
+SOBJS_PI = src/utils_precindep.o src/spreadinterp.o
 # spreader dual-precision objs
 SOBJSD = $(SOBJS) $(SOBJSF) $(SOBJS_PI)
 
@@ -209,7 +209,6 @@ HEADERS = $(wildcard include/*.h include/finufft/*.h) $(DUCC_HEADERS)
 include/finufft/fft.h: $(DUCC_SETUP)
 SHEAD = $(wildcard src/*.h) $(XSIMD_DIR)/include/xsimd/xsimd.hpp
 src/spreadinterp.o: $(SHEAD)
-src/spreadinterp_32.o: $(SHEAD)
 
 
 # lib -----------------------------------------------------------------------
@@ -277,10 +276,10 @@ test/%: test/%.cpp $(DYNLIB)
 test/%f: test/%.cpp $(DYNLIB)
 	$(CXX) $(CXXFLAGS) ${LDFLAGS} -DSINGLE $< $(ABSDYNLIB) $(LIBSFFT) -o $@
 # low-level tests that are cleaner if depend on only specific objects...
-test/testutils: test/testutils.cpp src/utils.o src/utils_precindep.o
-	$(CXX) $(CXXFLAGS) ${LDFLAGS} test/testutils.cpp src/utils.o src/utils_precindep.o $(LIBS) -o test/testutils
-test/testutilsf: test/testutils.cpp src/utils_32.o src/utils_precindep.o
-	$(CXX) $(CXXFLAGS) ${LDFLAGS} -DSINGLE test/testutils.cpp src/utils_32.o src/utils_precindep.o $(LIBS) -o test/testutilsf
+test/testutils: test/testutils.cpp src/utils_precindep.o
+	$(CXX) $(CXXFLAGS) ${LDFLAGS} test/testutils.cpp src/utils_precindep.o $(LIBS) -o test/testutils
+test/testutilsf: test/testutils.cpp src/utils_precindep.o
+	$(CXX) $(CXXFLAGS) ${LDFLAGS} -DSINGLE test/testutils.cpp src/utils_precindep.o $(LIBS) -o test/testutilsf
 
 # make sure all double-prec test executables ready for testing
 TESTS := $(basename $(wildcard test/*.cpp))