diff --git a/package/rtmpdump/rtmpdump.mk b/package/rtmpdump/rtmpdump.mk
index 6e0685e577..ad4308c5b6 100644
--- a/package/rtmpdump/rtmpdump.mk
+++ b/package/rtmpdump/rtmpdump.mk
@@ -32,22 +32,25 @@ else
 RTMPDUMP_SHARED = "SHARED="
 endif
 
+RTMPDUMP_MAKE_FLAGS = \
+	CRYPTO=$(RTMPDUMP_CRYPTO) \
+	prefix=/usr \
+	$(RTMPDUMP_SHARED)
+
 define RTMPDUMP_BUILD_CMDS
-	$(MAKE) CRYPTO=$(RTMPDUMP_CRYPTO) \
-		prefix=/usr \
+	$(MAKE) $(RTMPDUMP_MAKE_FLAGS) \
 		XCFLAGS="$(RTMPDUMP_CFLAGS)" \
 		XLDFLAGS="$(TARGET_LDFLAGS)" \
 		CROSS_COMPILE="$(TARGET_CROSS)" \
-		$(RTMPDUMP_SHARED) \
 		-C $(@D)/librtmp
 endef
 
 define RTMPDUMP_INSTALL_STAGING_CMDS
-	$(MAKE) prefix=/usr -C $(@D)/librtmp install DESTDIR=$(STAGING_DIR) $(RTMPDUMP_SHARED)
+	$(MAKE) -C $(@D)/librtmp install DESTDIR=$(STAGING_DIR) $(RTMPDUMP_MAKE_FLAGS)
 endef
 
 define RTMPDUMP_INSTALL_TARGET_CMDS
-	$(MAKE) prefix=/usr -C $(@D)/librtmp install DESTDIR=$(TARGET_DIR) $(RTMPDUMP_SHARED)
+	$(MAKE) -C $(@D)/librtmp install DESTDIR=$(TARGET_DIR) $(RTMPDUMP_MAKE_FLAGS)
 endef
 
 $(eval $(generic-package))