diff --git a/.ccls b/.ccls
new file mode 100644
index 0000000..17a6ea6
--- /dev/null
+++ b/.ccls
@@ -0,0 +1,7 @@
+arm-none-eabi-gcc
+# Headers
+-Isrc
+-Isrc/wifi/headers
+-Ibuild/generated/pico_base
+
+# Flags
diff --git a/shell.nix b/shell.nix
index b589d3d..8f259a3 100644
--- a/shell.nix
+++ b/shell.nix
@@ -18,6 +18,7 @@ pkgs.mkShell {
   ];
   shellHook = ''
     export PICO_SDK_PATH=${local-pico-sdk}/lib/pico-sdk
+    export NIX_CFLAGS_COMPILE="-isystem $(shopt -s globstar && echo $PICO_SDK_PATH/lib/**/include | sed "s/ / -isystem /g") -isystem $(shopt -s globstar && echo $PICO_SDK_PATH/src/**/include | sed "s/ / -isystem /g") -isystem $(shopt -s globstar && echo $PICO_SDK_PATH/lib/**/src | sed "s/ / -isystem /g") $NIX_CFLAGS_COMPILE"
     unset TEMP TMP TEMPDIR TMPDIR
   '';
 }