diff --git a/Makefile-AVR b/Makefile-AVR
index 28e61ec..a35ff36 100644
--- a/Makefile-AVR
+++ b/Makefile-AVR
@@ -159,22 +159,20 @@ all: $(PROGRAM).hex $(BUILDDIR)/$(PROGRAM).lst $(BUILDDIR)/$(PROGRAM).sym size
 program: $(PROGRAM).hex config.h
 	$(UPLOADER) $(UPLOADER_FLAGS) -U flash:w:$(PROGRAM).hex
 
-## Interpret TARGET section sizes wrt different AVR chips
-## Usage:  $(call show_size,section-name,section-regex,Atmega168-size-in-k,Atmega328p-size-in-k,Atmega644p-size-in-k,Atmega1280-size-in-k)
+## Interpret TARGET section sizes wrt different AVR chips.
+## Usage: $(call show_size,section-name,168-size,328p-size,644p-size,1280-size)
 define show_size
-	@$(OBJDUMP) -h $^ | \
-		perl -MPOSIX -ne \
-		'/.($2)\s+([0-9a-f]+)/ && do { $$a += eval "0x$$2" }; \
-		END { printf "    %-7s: %5d bytes         %3d%%       %3d%%       %3d%%     %3d%%\n", "$1", $$a, \
-			ceil($$a * 100 / ($3 * 1024)), \
-			ceil($$a * 100 / ($4 * 1024)), \
-			ceil($$a * 100 / ($5 * 1024)), \
-			ceil($$a * 100 / ($6 * 1024))  \
-		}'
+	@$(SIZE) -C $^ | awk '/$1/ { \
+	  printf("%8s %6d bytes      %3d%%      %3d%%      %3d%%      %3d%%\n", \
+	         $$1, $$2, \
+	         ($$2 * 100 / ($2 * 1024)) + 1, \
+	         ($$2 * 100 / ($3 * 1024)) + 1, \
+	         ($$2 * 100 / ($4 * 1024)) + 1, \
+	         ($$2 * 100 / ($5 * 1024)) + 1); }'
 endef
 
 size: $(BUILDDIR)/$(PROGRAM).elf
-	@echo "    SIZES             ATmega...  '168    '328(P)    '644(P)    '1280"
-	$(call show_size,FLASH,text,14,30,62,126)
-	$(call show_size,RAM,data|bss,1,2,4,8)
-	$(call show_size,EEPROM,eeprom,1,2,2,4)
+	@echo "ATmega sizes               '168   '328(P)   '644(P)     '1280"
+	$(call show_size,Program,14,30,62,126)
+	$(call show_size,Data,1,2,4,8)
+	$(call show_size,EEPROM,1,2,2,4)
diff --git a/Makefile-common b/Makefile-common
index 461f9b0..e7be5eb 100644
--- a/Makefile-common
+++ b/Makefile-common
@@ -47,6 +47,7 @@ CFLAGS += -save-temps=obj -DUSER_CONFIG='"$(USER_CONFIG)"'
 CC = $(TOOLCHAIN)gcc
 OBJDUMP = $(TOOLCHAIN)objdump
 OBJCOPY = $(TOOLCHAIN)objcopy
+SIZE    = $(TOOLCHAIN)size
 
 
 OBJ = $(patsubst %.c,$(BUILDDIR)/%.o,$(SOURCES))