diff --git a/package/iostat/iostat.mk b/package/iostat/iostat.mk
index d28dc1b76e..d591c67dcb 100644
--- a/package/iostat/iostat.mk
+++ b/package/iostat/iostat.mk
@@ -10,7 +10,8 @@ IOSTAT_LICENSE = GPL
 IOSTAT_LICENSE_FILES = LICENSE
 
 define IOSTAT_BUILD_CMDS
-	$(MAKE) -C $(@D) $(TARGET_CONFIGURE_OPTS)
+	$(MAKE) -C $(@D) $(TARGET_CONFIGURE_OPTS) \
+		CFLAGS="$(TARGET_CFLAGS) -DHZ=100"
 endef
 
 define IOSTAT_INSTALL_TARGET_CMDS