diff --git a/.github/workflows/lit.yml b/.github/workflows/lit.yml
index 254a064b8b..4858e5864b 100644
--- a/.github/workflows/lit.yml
+++ b/.github/workflows/lit.yml
@@ -10,8 +10,8 @@ on:
   workflow_dispatch:
 
 jobs:
-  lit-linux:
-    name: Lit (Linux)
+  lit-linux-debug:
+    name: lit tests (Linux, debug build)
     runs-on: ubuntu-latest
     container: ghcr.io/plc-lang/rust-llvm:latest
     steps:
@@ -20,4 +20,16 @@ jobs:
       - name: Run `build.sh --lit`
         shell: bash
         run: |
-          ./scripts/build.sh --lit
\ No newline at end of file
+          ./scripts/build.sh --lit
+
+  lit-linux-release:
+    name: lit tests (Linux, release build)
+    runs-on: ubuntu-latest
+    container: ghcr.io/plc-lang/rust-llvm:latest
+    steps:
+      - uses: actions/checkout@v3
+
+      - name: Run `build.sh --lit --release`
+        shell: bash
+        run: |
+          ./scripts/build.sh --lit --release
\ No newline at end of file
diff --git a/scripts/build.sh b/scripts/build.sh
index c3273ab75d..ab431fc90f 100755
--- a/scripts/build.sh
+++ b/scripts/build.sh
@@ -142,12 +142,16 @@ function run_check_style() {
 }
 
 function run_lit_test() {
-    # We need a binary to execute the lit tests
-    cargo build
-    cargo build --release
+    # We need a binary as well as the stdlib and its *.so file before running lit tests
+    run_build
+    run_std_build
+    run_package_std
 
-    lit -v -DCOMPILER=$project_location/target/debug/plc tests/lit/
-    lit -v -DCOMPILER=$project_location/target/release/plc tests/lit/
+    if [[ $release -eq 0 ]]; then
+        lit -v -DLIB=$project_location/output -DCOMPILER=$project_location/target/debug/plc tests/lit/
+    else
+        lit -v -DLIB=$project_location/output -DCOMPILER=$project_location/target/release/plc tests/lit/
+    fi
 }
 
 function run_test() {
@@ -201,6 +205,8 @@ function set_offline() {
 
 function run_package_std() {
     cc=$(get_compiler)
+    OUTPUT_DIR=$project_location/output
+    make_dir "$OUTPUT_DIR"
     log "Packaging Standard functions"
     log "Removing previous output folder"
     rm -rf $OUTPUT_DIR
@@ -433,11 +439,6 @@ if [[ $container -ne 0 ]]; then
     exit 0
 fi
 
-if [[ $package -ne 0 ]]; then
-    OUTPUT_DIR=$project_location/output
-    make_dir "$OUTPUT_DIR"
-fi
-
 if [[ $vendor -ne 0 ]]; then
     generate_sources
     exit 0
diff --git a/tests/lit/lit.cfg b/tests/lit/lit.cfg
index 5be5d0b6ae..eb46b868c4 100644
--- a/tests/lit/lit.cfg
+++ b/tests/lit/lit.cfg
@@ -4,16 +4,9 @@ config.test_format = lit.formats.ShTest(True)
 config.pipefail = False
 rustyRootDirectory = subprocess.check_output("dirname `cargo locate-project --message-format plain`", shell=True).decode("utf-8").strip()
 
-# TODO: These need to be adjusted to the action runner / build.sh file
-# compiler = lit_config.params["COMPILER"]
-# lib = lit_config.params["STDLIBPATH"]
-# arch = lit_config.params["ARCH"]
-# config.substitutions.append(('%COMPILE', f'{compiler} -o /tmp/%basename_t.out -liec61131std -L{lib}{arch}/lib/ -i "{lib}/include/*.st" -i {srcDir}/helpers/printf.pli  --linker=cc'))
-# config.substitutions.append(('%RUN', f'LD_LIBRARY_PATH="{lib}{arch}/lib" /tmp/%basename_t.out'))
-# config.substitutions.append(('%CHECK', f'FileCheck-14 --check-prefixes GREY,CHECK --allow-unused-prefixes --match-full-lines'))
-
 # ~/.local/bin/lit -v -DCOMPILER=/home/vosa@bachmann.at/Development/rusty/target/debug/plc ./tests/lit
-compiler = lit_config.params["COMPILER"]
-config.substitutions.append(('%COMPILE', f'{compiler} -o /tmp/%basename_t.out {rustyRootDirectory}/tests/lit/util/printf.pli --linker=cc'))
-config.substitutions.append(('%RUN', f'/tmp/%basename_t.out'))
+stdlibLocation = lit_config.params["LIB"]
+compilerLocation = lit_config.params["COMPILER"]
+config.substitutions.append(('%COMPILE', f'LD_LIBRARY_PATH="{stdlibLocation}/lib" {compilerLocation} -o /tmp/%basename_t.out -liec61131std -L{stdlibLocation}/lib -i "{stdlibLocation}/include/*.st" -i {rustyRootDirectory}/tests/lit/util/printf.pli --linker=cc'))
+config.substitutions.append(('%RUN', f'LD_LIBRARY_PATH="{stdlibLocation}/lib" /tmp/%basename_t.out'))
 config.substitutions.append(('%CHECK', f'FileCheck-14 --check-prefixes CHECK --allow-unused-prefixes --match-full-lines'))
\ No newline at end of file
diff --git a/tests/lit/single/arithmetic/addition.st b/tests/lit/single/arithmetic/addition.st
index 6ee546ed3e..79d620ec0e 100644
--- a/tests/lit/single/arithmetic/addition.st
+++ b/tests/lit/single/arithmetic/addition.st
@@ -1,4 +1,5 @@
 // RUN: (%COMPILE %s && %RUN) | %CHECK %s
+// CHECK: 10
 FUNCTION main
     VAR
         x : DINT;
@@ -8,5 +9,4 @@ FUNCTION main
     x := 5;
     y := 5;
     printf('%d$N', x + y);
-    // CHECK: 10
 END_FUNCTION
diff --git a/tests/lit/single/arithmetic/sqrt.st b/tests/lit/single/arithmetic/sqrt.st
new file mode 100644
index 0000000000..5bedfc48fd
--- /dev/null
+++ b/tests/lit/single/arithmetic/sqrt.st
@@ -0,0 +1,8 @@
+// RUN: (%COMPILE %s && %RUN) | %CHECK %s
+// CHECK: 2
+FUNCTION main
+    VAR
+        res : LREAL;
+    END_VAR
+    printf('%d$N', REAL_TO_DINT(SQRT(4.0)));
+END_FUNCTION