diff --git a/Makefile b/Makefile
index 673a2896..04045832 100644
--- a/Makefile
+++ b/Makefile
@@ -131,8 +131,8 @@ CCFLAGS += 			\
 	-mtext-section-literals
 #	-Wall			
 
-CFLAGS = $(CCFLAGS) $(DEFINES) $(EXTRA_CCFLAGS) $(INCLUDES)
-DFLAGS = $(CCFLAGS) $(DDEFINES) $(EXTRA_CCFLAGS) $(INCLUDES)
+CFLAGS = $(CCFLAGS) $(DEFINES) $(EXTRA_CCFLAGS) $(STD_CFLAGS) $(INCLUDES)
+DFLAGS = $(CCFLAGS) $(DDEFINES) $(EXTRA_CCFLAGS) $(STD_CFLAGS) $(INCLUDES)
 
 
 #############################################################
diff --git a/app/include/lwipopts.h b/app/include/lwipopts.h
index eaa8dd6b..4d9ad469 100644
--- a/app/include/lwipopts.h
+++ b/app/include/lwipopts.h
@@ -789,7 +789,6 @@
 #ifndef LWIP_MDNS
 #define LWIP_MDNS                      1
 #endif
-/*
 /*
    ----------------------------------
    ---------- DNS options -----------
diff --git a/app/modules/Makefile b/app/modules/Makefile
index 848c3834..9733642d 100644
--- a/app/modules/Makefile
+++ b/app/modules/Makefile
@@ -15,7 +15,7 @@ ifndef PDIR
 GEN_LIBS = libmodules.a
 endif
 
-EXTRA_CCFLAGS+=-std=gnu11
+STD_CFLAGS=-std=gnu11 -Wimplicit
 
 #############################################################
 # Configuration i.e. compile options etc.
diff --git a/app/modules/tmr.c b/app/modules/tmr.c
index c88af871..357aa1a4 100755
--- a/app/modules/tmr.c
+++ b/app/modules/tmr.c
@@ -52,6 +52,7 @@ tmr.softwd(int)
 #include "lauxlib.h"
 #include "platform.h"
 #include "c_types.h"
+#include "user_interface.h"
 
 #define TIMER_MODE_OFF 3
 #define TIMER_MODE_SINGLE 0
diff --git a/app/platform/platform.h b/app/platform/platform.h
index 0669ff9d..dce7a3f5 100644
--- a/app/platform/platform.h
+++ b/app/platform/platform.h
@@ -260,6 +260,7 @@ void* platform_get_last_free_ram( unsigned id );
 
 int platform_ow_exists( unsigned id );
 int platform_gpio_exists( unsigned id );
+int platform_tmr_exists( unsigned id );
 
 // *****************************************************************************
 // Helper macros