diff --git a/examples/mqtt-dashboard/device/Makefile b/examples/mqtt-dashboard/device/Makefile
index 6bad4d93..ba864f72 100644
--- a/examples/mqtt-dashboard/device/Makefile
+++ b/examples/mqtt-dashboard/device/Makefile
@@ -1,32 +1,24 @@
-PROG ?= example                   # Program we are building
-DELETE = rm -rf                   # Command to remove files
+PROG ?= ./example                 # Program we are building
+DELETE ?= rm -rf                  # Command to remove files
 OUT ?= -o $(PROG)                 # Compiler argument for output file
 SOURCES = main.c net.c mongoose.c # Source code files
-CFLAGS = -W -Wall -Wextra -g -I.  # Build options
+CFLAGS ?= -W -Wall -Wextra -g -I. # Build options
 
 # Mongoose build options. See https://mongoose.ws/documentation/#build-options
 CFLAGS_MONGOOSE += -DMG_ENABLE_LINES=1
 
-ifeq ($(OS),Windows_NT)   # Windows settings. Assume MinGW compiler. To use VC: make CC=cl CFLAGS=/MD OUT=/Feprog.exe
-  PROG ?= example.exe           # Use .exe suffix for the binary
+ifeq ($(OS),Windows_NT)   # Windows settings for MinGW compiler. To use VC: make CC=cl CFLAGS=/MD OUT=/Feexample.exe
+  PROG = example.exe            # Use .exe suffix for the binary
   CC = gcc                      # Use MinGW gcc compiler
-  CFLAGS += -lws2_32            # Link against Winsock library
+  CFLAGS += -lws2_32            # Link against the Winsock library
   DELETE = cmd /C del /Q /F /S  # Command prompt command to delete files
-  OUT ?= -o $(PROG)             # Build output
-  MAKE += WINDOWS=1 CC=$(CC)
 endif
 
-all: $(PROG)              # Default target. Build and run program
-	$(RUN) ./$(PROG) $(ARGS)
+all: $(PROG)
+	$(RUN) $(PROG) $(ARGS)
 
-$(PROG): $(SOURCES)       # Build program from sources
+$(PROG): $(SOURCES)
 	$(CC) $(SOURCES) $(CFLAGS) $(CFLAGS_MONGOOSE) $(CFLAGS_EXTRA) $(OUT)
 
-clean:                    # Cleanup. Delete built program and all build artifacts
-	$(DELETE) $(PROG) *.o *.obj *.exe *.dSYM mbedtls
-
-# see https://mongoose.ws/tutorials/tls/#how-to-build for TLS build options
-
-mbedtls:                  # Pull and build mbedTLS library
-	git clone --depth 1 -b v2.28.2 https://github.com/mbed-tls/mbedtls $@
-	$(MAKE) -C mbedtls/library
+clean:
+	$(DELETE) $(PROG) *.o *.obj *.exe *.dSYM
diff --git a/examples/mqtt-dashboard/device/net.c b/examples/mqtt-dashboard/device/net.c
index d643cbb7..f86bbcd9 100644
--- a/examples/mqtt-dashboard/device/net.c
+++ b/examples/mqtt-dashboard/device/net.c
@@ -24,7 +24,7 @@ static void set_device_id(void) {
   char buf[15] = "";
 
 #ifdef _WIN32
-  unsigned serial = 0;
+  unsigned long serial = 0;
   if (GetVolumeInformationA("c:\\", NULL, 0, &serial, NULL, NULL, NULL, 0)) {
     mg_snprintf(buf, sizeof(buf), "%lx", serial);
   }