diff --git a/Python/ceval.c b/Python/ceval.c
index e92a11b16cec81..6dc26feb88be90 100644
--- a/Python/ceval.c
+++ b/Python/ceval.c
@@ -245,8 +245,8 @@ maybe_lltrace_resume_frame(_PyInterpreterFrame *frame, _PyInterpreterFrame *skip
     if (!lltrace) {
         // Can also be controlled by environment variable
         char *python_lltrace = Py_GETENV("PYTHON_LLTRACE");
-        if (python_lltrace != NULL && *python_lltrace >= '0') {
-            lltrace = *python_lltrace - '0';  // TODO: Parse an int and all that
+        if (python_lltrace != NULL) {
+            lltrace = atoi(python_lltrace);
         }
     }
     if (lltrace >= 5) {
diff --git a/Python/optimizer.c b/Python/optimizer.c
index 6a4d20fad76c15..b1155b6a0d897c 100644
--- a/Python/optimizer.c
+++ b/Python/optimizer.c
@@ -567,8 +567,8 @@ translate_bytecode_to_trace(
 #ifdef Py_DEBUG
     char *python_lltrace = Py_GETENV("PYTHON_LLTRACE");
     int lltrace = 0;
-    if (python_lltrace != NULL && *python_lltrace >= '0') {
-        lltrace = *python_lltrace - '0';  // TODO: Parse an int and all that
+    if (python_lltrace != NULL) {
+        lltrace = atoi(python_lltrace);
     }
 #endif
 
@@ -1193,8 +1193,8 @@ make_executor_from_uops(_PyUOpInstruction *buffer, int length, const _PyBloomFil
 #ifdef Py_DEBUG
     char *python_lltrace = Py_GETENV("PYTHON_LLTRACE");
     int lltrace = 0;
-    if (python_lltrace != NULL && *python_lltrace >= '0') {
-        lltrace = *python_lltrace - '0';  // TODO: Parse an int and all that
+    if (python_lltrace != NULL) {
+        lltrace = atoi(python_lltrace);
     }
     if (lltrace >= 2) {
         printf("Optimized trace (length %d):\n", length);
diff --git a/Python/optimizer_analysis.c b/Python/optimizer_analysis.c
index 0ef15c630e91db..2b24630f1bf0c5 100644
--- a/Python/optimizer_analysis.c
+++ b/Python/optimizer_analysis.c
@@ -41,8 +41,8 @@
     static inline int get_lltrace(void) {
         char *uop_debug = Py_GETENV(DEBUG_ENV);
         int lltrace = 0;
-        if (uop_debug != NULL && *uop_debug >= '0') {
-            lltrace = *uop_debug - '0';  // TODO: Parse an int and all that
+        if (uop_debug != NULL) {
+            lltrace = atoi(uop_debug);
         }
         return lltrace;
     }
diff --git a/Python/optimizer_symbols.c b/Python/optimizer_symbols.c
index 40cbf95e3d6d39..80b5b489a27e80 100644
--- a/Python/optimizer_symbols.c
+++ b/Python/optimizer_symbols.c
@@ -37,8 +37,8 @@
 static inline int get_lltrace(void) {
     char *uop_debug = Py_GETENV("PYTHON_OPT_DEBUG");
     int lltrace = 0;
-    if (uop_debug != NULL && *uop_debug >= '0') {
-        lltrace = *uop_debug - '0';  // TODO: Parse an int and all that
+    if (uop_debug != NULL) {
+        lltrace = atoi(uop_debug);
     }
     return lltrace;
 }