diff --git a/.github/workflows/codeql.yml b/.github/workflows/codeql.yml
new file mode 100644
index 00000000..2af60131
--- /dev/null
+++ b/.github/workflows/codeql.yml
@@ -0,0 +1,47 @@
+name: "CodeQL"
+
+on:
+  push:
+    branches: [ "master" ]
+  pull_request:
+    branches: [ "master" ]
+  schedule:
+    - cron: '41 4 * * 2'
+
+jobs:
+  analyze:
+    name: Analyze (${{ matrix.language }})
+    runs-on: 'ubuntu-20.04'
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+        - language: c-cpp
+    steps:
+    - name: Checkout repository
+      uses: actions/checkout@v4
+
+    - name: Initialize CodeQL
+      uses: github/codeql-action/init@v3
+      with:
+        languages: ${{ matrix.language }}
+
+    - name: Install packages
+      run: |
+        sudo apt update
+        sudo apt-get install -y \
+              autoconf \
+              build-essential \
+              gperf \
+              check \
+              help2man \
+
+    - name: Build
+      run: |
+        ./autogen.sh
+        make
+
+    - name: Perform CodeQL Analysis
+      uses: github/codeql-action/analyze@v3
+      with:
+        category: "/language:${{matrix.language}}"
diff --git a/src/naemon/macros.c b/src/naemon/macros.c
index 587a75a4..abcd5ece 100644
--- a/src/naemon/macros.c
+++ b/src/naemon/macros.c
@@ -76,7 +76,7 @@ static const struct macro_key_code *find_macro_key(const char *name)
 	struct macro_key_code *key;
 
 	high = MACRO_X_COUNT;
-	while (high - low > 0) {
+	while (high > low) {
 		unsigned int mid = low + ((high - low) / 2);
 		key = &macro_keys[mid];
 		value = strcmp(name, key->name);
diff --git a/src/naemon/sretention.c b/src/naemon/sretention.c
index d99938c7..3d3d3d69 100644
--- a/src/naemon/sretention.c
+++ b/src/naemon/sretention.c
@@ -24,7 +24,7 @@ void save_state_information_eventhandler(struct nm_event_execution_properties *e
 	int status;
 
 	if (evprop->execution_type == EVENT_EXEC_NORMAL) {
-		schedule_event(retention_update_interval * interval_length, save_state_information_eventhandler, evprop->user_data);
+		schedule_event((time_t)retention_update_interval * interval_length, save_state_information_eventhandler, evprop->user_data);
 
 		status = save_state_information(TRUE);
 
@@ -44,7 +44,7 @@ int initialize_retention_data()
 
 	/* add a retention data save event if needed */
 	if (retain_state_information == TRUE && retention_update_interval > 0)
-		schedule_event(retention_update_interval * interval_length, save_state_information_eventhandler, NULL);
+		schedule_event((time_t)retention_update_interval * interval_length, save_state_information_eventhandler, NULL);
 
 	return xrddefault_initialize_retention_data();
 }
diff --git a/src/naemon/utils.c b/src/naemon/utils.c
index 1c101f44..2571fb67 100644
--- a/src/naemon/utils.c
+++ b/src/naemon/utils.c
@@ -875,11 +875,11 @@ int generate_check_stats(void)
 			/* determine value by weighting this/last buckets... */
 			/* if this is the current bucket, use its full value + weighted % of last bucket */
 			if (x == 0) {
-				bucket_value = (int)(this_bucket_value + floor(last_bucket_value * last_bucket_weight));
+				bucket_value = (int)(this_bucket_value + floor((double)last_bucket_value * last_bucket_weight));
 			}
 			/* otherwise use weighted % of this and last bucket */
 			else {
-				bucket_value = (int)(ceil(this_bucket_value * this_bucket_weight) + floor(last_bucket_value * last_bucket_weight));
+				bucket_value = (int)(ceil((double)this_bucket_value * this_bucket_weight) + floor((double)last_bucket_value * (double)last_bucket_weight));
 			}
 
 			/* 1 minute stats */