diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 81fff48..1e2800a 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -14,6 +14,9 @@ jobs:
     steps:
       - uses: actions/checkout@v4
 
+      - name: Build & test aux functions
+        run: bash tools/test_stencil_aux.sh
+
       - name: Build object files
         run: bash tools/crosscompile.sh
 
diff --git a/stencils/aux_functions.c b/stencils/aux_functions.c
index 97b28eb..3301687 100644
--- a/stencils/aux_functions.c
+++ b/stencils/aux_functions.c
@@ -12,7 +12,7 @@ __attribute__((noinline)) int floor_div(float arg1, float arg2) {
     return i;
 }
 
-__attribute__((noinline)) float sqrt(float n) {
+__attribute__((noinline)) float aux_sqrt(float n) {
     if (n < 0) return -1;
 
     float x = n;             // initial guess
@@ -25,12 +25,12 @@ __attribute__((noinline)) float sqrt(float n) {
     return x;
 }
 
-__attribute__((noinline)) float sqrt2(float n) {
+__attribute__((noinline)) float aux_sqrt2(float n) {
     return n * 20.5 + 4.5;
 }
 
-__attribute__((noinline)) float get_42(float n) {
-    return n * + 42.0;
+__attribute__((noinline)) float aux_get_42(float n) {
+    return n + 42.0;
 }
 
 float fast_pow_float(float base, float exponent) {
@@ -49,8 +49,9 @@ float fast_pow_float(float base, float exponent) {
 int main() {
     // Test aux functions
     float a = 16.0f;
-    float sqrt_a = fast_sqrt(a);
+    float sqrt_a = aux_sqrt(a);
     float pow_a = fast_pow_float(a, 0.5f);
-    float sqrt2_a = fast_sqrt2(a);
+    float sqrt2_a = aux_sqrt2(a);
+    float g42 = aux_get_42(0.0f);
     return 0;
 }
\ No newline at end of file
diff --git a/stencils/generate_stencils.py b/stencils/generate_stencils.py
index d26ee88..cf597bf 100644
--- a/stencils/generate_stencils.py
+++ b/stencils/generate_stencils.py
@@ -82,7 +82,7 @@ def get_cast(type1: str, type2: str, type_out: str) -> str:
 def get_func2(func_name: str, type1: str, type2: str) -> str:
     return f"""
     {stencil_func_prefix}void {func_name}_{type1}_{type2}({type1} arg1, {type2} arg2) {{
-        result_float_{type2}({func_name}((float)arg1), arg2);
+        result_float_{type2}(aux_{func_name}((float)arg1), arg2);
     }}
     """
 
diff --git a/tools/test_stencil_aux.sh b/tools/test_stencil_aux.sh
new file mode 100644
index 0000000..b4172b8
--- /dev/null
+++ b/tools/test_stencil_aux.sh
@@ -0,0 +1,19 @@
+#!/bin/bash
+
+set -e
+set -v
+
+mkdir -p bin
+FILE=aux_functions
+SRC=stencils/$FILE.c
+DEST=bin
+OPT=O3
+
+mkdir -p $DEST
+
+# Compile native x86_64
+gcc -g -$OPT $SRC -o $DEST/$FILE
+chmod +x $DEST/$FILE
+
+# Run
+$DEST/$FILE
\ No newline at end of file