diff --git a/tools/check-formatting.sh b/tools/check-formatting.sh
index 31fe22b7..0d55a420 100755
--- a/tools/check-formatting.sh
+++ b/tools/check-formatting.sh
@@ -4,11 +4,7 @@ source $(dirname $0)/env.sh
 
 cd $LUNA_ROOT
 
-SOURCES=($(find kernel/src -type f | grep -v "\.asm"))
-SOURCES+=($(find libluna/src -type f))
-SOURCES+=($(find libluna/include/luna -type f))
-SOURCES+=($(find libos/src -type f))
-SOURCES+=($(find libos/include/os -type f))
+source tools/sources.sh
 
 ALL_OK=1
 
diff --git a/tools/check-stdint.sh b/tools/check-stdint.sh
index 855fece7..30791a8b 100755
--- a/tools/check-stdint.sh
+++ b/tools/check-stdint.sh
@@ -1,15 +1,12 @@
 #!/usr/bin/env bash
 
-set -e
 source $(dirname $0)/env.sh
 
 cd $LUNA_ROOT
 
-SOURCES=($(find kernel/src -type f | grep -v "\.asm" | grep -v "bootboot.h"))
-SOURCES+=($(find libluna/src -type f))
-SOURCES+=($(find libluna/include/luna -type f | grep -v "Types.h"))
-SOURCES+=($(find libos/src -type f))
-SOURCES+=($(find libos/include/os -type f))
+source tools/sources.sh
+
+SOURCES=($(printf -- '%s\n' "${SOURCES[@]}" | grep -v libc | grep -v "Types.h" | grep -v "bootboot.h"))
 
 SUCCESS=1
 
diff --git a/tools/replace-stdint.sh b/tools/replace-stdint.sh
index 00a9f954..6ef9bb2b 100755
--- a/tools/replace-stdint.sh
+++ b/tools/replace-stdint.sh
@@ -5,11 +5,9 @@ source $(dirname $0)/env.sh
 
 cd $LUNA_ROOT
 
-SOURCES=($(find kernel/src -type f | grep -v "\.asm" | grep -v "bootboot.h"))
-SOURCES+=($(find libluna/src -type f))
-SOURCES+=($(find libluna/include/luna -type f | grep -v "Types.h"))
-SOURCES+=($(find libos/src -type f))
-SOURCES+=($(find libos/include/os -type f))
+source tools/sources.sh
+
+SOURCES=($(printf -- '%s\n' "${SOURCES[@]}" | grep -v libc | grep -v "Types.h" | grep -v "bootboot.h"))
 
 for f in ${SOURCES[@]}
 do
diff --git a/tools/run-clang-format.sh b/tools/run-clang-format.sh
index 1c154302..3b4dba80 100755
--- a/tools/run-clang-format.sh
+++ b/tools/run-clang-format.sh
@@ -5,11 +5,7 @@ source $(dirname $0)/env.sh
 
 cd $LUNA_ROOT
 
-SOURCES=($(find kernel/src -type f | grep -v "\.asm"))
-SOURCES+=($(find libluna/src -type f))
-SOURCES+=($(find libluna/include/luna -type f))
-SOURCES+=($(find libos/src -type f))
-SOURCES+=($(find libos/include/os -type f))
+source tools/sources.sh
 
 for f in ${SOURCES[@]}
 do
diff --git a/tools/sources.sh b/tools/sources.sh
new file mode 100755
index 00000000..ecfe3b70
--- /dev/null
+++ b/tools/sources.sh
@@ -0,0 +1,12 @@
+#!/bin/sh
+
+source $(dirname $0)/env.sh
+
+cd $LUNA_ROOT
+
+FOLDERS=(kernel libc libos libluna apps)
+
+SOURCES=($(find ${FOLDERS[@]} -type f -name "*.cpp"))
+SOURCES+=($(find ${FOLDERS[@]} -type f -name "*.h"))
+
+export SOURCES