diff --git a/Makefile.am b/Makefile.am
index 11c88a5a4..5442bfc36 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -79,6 +79,8 @@ audacity$(EXEEXT): src/audacity$(EXEEXT)
 
 modules:
 	mkdir -p modules
-	(cd lib-src/mod-nyq-bench && make && cp .libs/mod-nyq-bench.so ../../modules)
+	(cd lib-src/mod-nyq-bench && make clean && make && cp .libs/mod-nyq-bench.so ../../modules)
+
+.PHONY: modules
 
 CLEANFILES = audacity$(EXEEXT) plug-ins nyquist locale modules
diff --git a/Makefile.in b/Makefile.in
index ca839ff24..22d0dfae4 100644
--- a/Makefile.in
+++ b/Makefile.in
@@ -1128,7 +1128,9 @@ audacity$(EXEEXT): src/audacity$(EXEEXT)
 
 modules:
 	mkdir -p modules
-	(cd lib-src/mod-nyq-bench && make && cp .libs/mod-nyq-bench.so ../../modules)
+	(cd lib-src/mod-nyq-bench && make clean && make && cp .libs/mod-nyq-bench.so ../../modules)
+
+.PHONY: modules
 
 # Tell versions [3.59,3.63) of GNU make to not export all variables.
 # Otherwise a system limit (for SysV at least) may be exceeded.