diff --git a/makefile b/makefile
index ce33665..d85152e 100644
--- a/makefile
+++ b/makefile
@@ -148,9 +148,12 @@ clean:
 
 install: install-oprf install-noiseXK
 
-install-oprf: $(DESTDIR)$(PREFIX)/lib/liboprf.$(SOEXT) \
-	$(DESTDIR)$(PREFIX)/$(DEBUGDIR)/liboprf.$(SOEXT).debug \
-	$(DESTDIR)$(PREFIX)/lib/liboprf.$(STATICEXT) \
+INSTALL_EXT=$(STATICEXT)
+ifeq ($(findstring -shared,$(LDFLAGS)),)
+	INSTALL_EXT=$(SOEXT)
+endif
+
+install-oprf: $(DESTDIR)$(PREFIX)/lib/liboprf.$(INSTALL_EXT) \
 	$(DESTDIR)$(PREFIX)/lib/pkgconfig/liboprf.pc \
 	$(DESTDIR)$(PREFIX)/include/oprf/oprf.h \
 	$(DESTDIR)$(PREFIX)/include/oprf/toprf.h \
diff --git a/noise_xk/makefile b/noise_xk/makefile
index 0f18a04..b6261a5 100644
--- a/noise_xk/makefile
+++ b/noise_xk/makefile
@@ -56,7 +56,12 @@ clean:
 liboprf-noiseXK.$(SOEXT).$(SOVER): liboprf-noiseXK.$(SOEXT)
 	ln -sf $^ $@
 
-install: $(DESTDIR)$(PREFIX)/lib/liboprf-noiseXK.$(SOEXT) $(DESTDIR)$(PREFIX)/lib/liboprf-noiseXK.$(STATICEXT) $(DESTDIR)$(PREFIX)/include/oprf/noiseXK
+INSTALL_EXT=$(STATICEXT)
+ifeq ($(findstring -shared,$(LDFLAGS)),)
+        INSTALL_EXT=$(SOEXT)
+endif
+
+install: $(DESTDIR)$(PREFIX)/lib/liboprf-noiseXK.$(INSTALL_EXT) $(DESTDIR)$(PREFIX)/include/oprf/noiseXK
 
 uninstall: $(DESTDIR)$(PREFIX)/lib/liboprf-noiseXK.$(SOEXT) $(DESTDIR)$(PREFIX)/lib/liboprf-noiseXK.$(STATICEXT) $(DESTDIR)$(PREFIX)/include/oprf/noiseXK
 	rm -rf $^