diff --git a/demos/Posix-GCC/Makefile b/demos/Posix-GCC/Makefile
index f5eae1c05..5d77f6a8e 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/Posix-GCC/main.c b/demos/Posix-GCC/main.c
index 7514faebf..d4ed8f9c8 100644
--- a/demos/Posix-GCC/main.c
+++ b/demos/Posix-GCC/main.c
@@ -18,6 +18,8 @@
     along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
+#include <stdio.h>
+
 #include "ch.h"
 #include "hal.h"
 #include "test.h"
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 ac803932a..ec6d26d47 100644
--- a/readme.txt
+++ b/readme.txt
@@ -82,6 +82,8 @@
 *****************************************************************************
 
 *** 2.5.2 ***
+- FIX: Fixed compile errors in Posix-GCC demo (bug 3601621)(backported
+  to 2.4.4).
 - FIX: Fixed state checker error in MSP430 port (bug 3601460)(backported
   to 2.4.4).
 - FIX: Fixed wrong assertion in UART driver (bug 3600789)(backported