diff --git a/demos/Posix-GCC/Makefile b/demos/Posix-GCC/Makefile
index 5e2b4d4f8..58a18f8fb 100644
--- a/demos/Posix-GCC/Makefile
+++ b/demos/Posix-GCC/Makefile
@@ -132,10 +132,10 @@ CPFLAGS += -MD -MP -MF .dep/$(@F).d
 
 all: $(OBJS) $(PROJECT)
 
-%o : %c
+%.o : %.c
 	$(CC) -c $(CPFLAGS) -I . $(INCDIR) $< -o $@
 
-%o : %s
+%.o : %.s
 	$(AS) -c $(ASFLAGS) $< -o $@
 
 $(PROJECT): $(OBJS)
diff --git a/demos/Win32-MinGW/Makefile b/demos/Win32-MinGW/Makefile
index 73e938d44..1b77c241c 100644
--- a/demos/Win32-MinGW/Makefile
+++ b/demos/Win32-MinGW/Makefile
@@ -117,10 +117,10 @@ CPFLAGS += -MD -MP -MF .dep/$(@F).d
 
 all: $(OBJS) $(PROJECT).exe
 
-%o : %c
+%.o : %.c
 	$(CC) -c $(CPFLAGS) -I . $(INCDIR) $< -o $@
 
-%o : %s
+%.o : %.s
 	$(AS) -c $(ASFLAGS) $< -o $@
 
 %exe: $(OBJS)
diff --git a/readme.txt b/readme.txt
index 7bacc80e8..c25d3ad54 100644
--- a/readme.txt
+++ b/readme.txt
@@ -79,6 +79,7 @@
 *****************************************************************************
 
 *** 2.4.4 ***
+- FIX: Fixed compile errors in Posix-GCC demo (bug 3601621).
 - FIX: Fixed state checker error in MSP430 port (bug 3601460).
 - FIX: Fixed wrong assertion in UART driver (bug 3600789).
 - FIX: Fixed small bug in shell argument parsing code in shell_thread (bug