diff --git a/src/modules/math/Makefile.src b/src/modules/math/Makefile.src
index 00cd60c6c1141d143cb648413623a93a9681ec91..6a15780545fec97d726eed4843a2cb6badb1906e 100644
--- a/src/modules/math/Makefile.src
+++ b/src/modules/math/Makefile.src
@@ -12,7 +12,7 @@ math.a: $(FILES)
 	echo >linker_options @LIBS@
 
 clean:
-	-rm -f *.o
+	-rm -f *.o *.a
 
 depend:
 	gcc -MM $(PREFLAGS) $(SRCDIR)/*.c | $(TMP_BINDIR)/fixdepends.sh $(SRCDIR)