diff --git a/14-checkpoint/Makefile b/14-checkpoint/Makefile
index b611257..45cc9e4 100644
--- a/14-checkpoint/Makefile
+++ b/14-checkpoint/Makefile
@@ -11,7 +11,7 @@ CFLAGS = -g
 
 # First rule is run by default
 os-image.bin: boot/bootsect.bin kernel.bin
-	cat $^ > os-image.bin
+	cat $^ > $@
 
 # '--oformat binary' deletes all symbols as a collateral, so we don't need
 # to 'strip' them manually on this case
diff --git a/15-video-ports/Makefile b/15-video-ports/Makefile
index b611257..45cc9e4 100644
--- a/15-video-ports/Makefile
+++ b/15-video-ports/Makefile
@@ -11,7 +11,7 @@ CFLAGS = -g
 
 # First rule is run by default
 os-image.bin: boot/bootsect.bin kernel.bin
-	cat $^ > os-image.bin
+	cat $^ > $@
 
 # '--oformat binary' deletes all symbols as a collateral, so we don't need
 # to 'strip' them manually on this case
diff --git a/16-video-driver/Makefile b/16-video-driver/Makefile
index b611257..45cc9e4 100644
--- a/16-video-driver/Makefile
+++ b/16-video-driver/Makefile
@@ -11,7 +11,7 @@ CFLAGS = -g
 
 # First rule is run by default
 os-image.bin: boot/bootsect.bin kernel.bin
-	cat $^ > os-image.bin
+	cat $^ > $@
 
 # '--oformat binary' deletes all symbols as a collateral, so we don't need
 # to 'strip' them manually on this case
diff --git a/17-video-scroll/Makefile b/17-video-scroll/Makefile
index b611257..45cc9e4 100644
--- a/17-video-scroll/Makefile
+++ b/17-video-scroll/Makefile
@@ -11,7 +11,7 @@ CFLAGS = -g
 
 # First rule is run by default
 os-image.bin: boot/bootsect.bin kernel.bin
-	cat $^ > os-image.bin
+	cat $^ > $@
 
 # '--oformat binary' deletes all symbols as a collateral, so we don't need
 # to 'strip' them manually on this case
diff --git a/18-interrupts/Makefile b/18-interrupts/Makefile
index 8a68aa0..d7e16c5 100644
--- a/18-interrupts/Makefile
+++ b/18-interrupts/Makefile
@@ -11,7 +11,7 @@ CFLAGS = -g
 
 # First rule is run by default
 os-image.bin: boot/bootsect.bin kernel.bin
-	cat $^ > os-image.bin
+	cat $^ > $@
 
 # '--oformat binary' deletes all symbols as a collateral, so we don't need
 # to 'strip' them manually on this case
diff --git a/19-interrupts-irqs/Makefile b/19-interrupts-irqs/Makefile
index 8a68aa0..d7e16c5 100644
--- a/19-interrupts-irqs/Makefile
+++ b/19-interrupts-irqs/Makefile
@@ -11,7 +11,7 @@ CFLAGS = -g
 
 # First rule is run by default
 os-image.bin: boot/bootsect.bin kernel.bin
-	cat $^ > os-image.bin
+	cat $^ > $@
 
 # '--oformat binary' deletes all symbols as a collateral, so we don't need
 # to 'strip' them manually on this case
diff --git a/20-interrupts-timer/Makefile b/20-interrupts-timer/Makefile
index 4d6da94..3abf8ce 100644
--- a/20-interrupts-timer/Makefile
+++ b/20-interrupts-timer/Makefile
@@ -11,7 +11,7 @@ CFLAGS = -g
 
 # First rule is run by default
 os-image.bin: boot/bootsect.bin kernel.bin
-	cat $^ > os-image.bin
+	cat $^ > $@
 
 # '--oformat binary' deletes all symbols as a collateral, so we don't need
 # to 'strip' them manually on this case
diff --git a/21-shell/Makefile b/21-shell/Makefile
index 1478294..b347fc8 100644
--- a/21-shell/Makefile
+++ b/21-shell/Makefile
@@ -12,7 +12,7 @@ CFLAGS = -g -m32 -nostdlib -nostdinc -fno-builtin -fno-stack-protector -nostartf
 
 # First rule is run by default
 os-image.bin: boot/bootsect.bin kernel.bin
-	cat $^ > os-image.bin
+	cat $^ > $@
 
 # '--oformat binary' deletes all symbols as a collateral, so we don't need
 # to 'strip' them manually on this case
diff --git a/22-malloc/Makefile b/22-malloc/Makefile
index 1478294..b347fc8 100644
--- a/22-malloc/Makefile
+++ b/22-malloc/Makefile
@@ -12,7 +12,7 @@ CFLAGS = -g -m32 -nostdlib -nostdinc -fno-builtin -fno-stack-protector -nostartf
 
 # First rule is run by default
 os-image.bin: boot/bootsect.bin kernel.bin
-	cat $^ > os-image.bin
+	cat $^ > $@
 
 # '--oformat binary' deletes all symbols as a collateral, so we don't need
 # to 'strip' them manually on this case
diff --git a/23-fixes/Makefile b/23-fixes/Makefile
index 65e577b..7c244b6 100644
--- a/23-fixes/Makefile
+++ b/23-fixes/Makefile
@@ -11,7 +11,7 @@ CFLAGS = -g -ffreestanding -Wall -Wextra -fno-exceptions -m32
 
 # First rule is run by default
 os-image.bin: boot/bootsect.bin kernel.bin
-	cat $^ > os-image.bin
+	cat $^ > $@
 
 # '--oformat binary' deletes all symbols as a collateral, so we don't need
 # to 'strip' them manually on this case