diff --git a/integration_tests/test_str_to_int.py b/integration_tests/test_str_to_int.py
index 374ca141f0..765dd1e0f3 100644
--- a/integration_tests/test_str_to_int.py
+++ b/integration_tests/test_str_to_int.py
@@ -20,4 +20,10 @@ def f():
     i = i32(int(s))
     assert i == -1234
 
+    assert i32(int("  3   ")) == 3
+    assert i32(int("+3")) == 3
+    assert i32(int("\n3")) == 3
+    assert i32(int("3\n")) == 3
+    assert i32(int("\r\t\n3\r\t\n")) == 3
+
 f()
diff --git a/src/lpython/semantics/python_intrinsic_eval.h b/src/lpython/semantics/python_intrinsic_eval.h
index cb3c777e42..99a8053a2b 100644
--- a/src/lpython/semantics/python_intrinsic_eval.h
+++ b/src/lpython/semantics/python_intrinsic_eval.h
@@ -77,20 +77,34 @@ struct IntrinsicNodeHandler {
                 char *c = ASR::down_cast<ASR::StringConstant_t>(
                                     ASRUtils::expr_value(arg))->m_s;
                 int ival = 0;
+                std::string str;
                 char *ch = c;
-                if (*ch == '-') {
+                if (*ch == '-' || *ch == '+') {
                     ch++;
                 }
                 while (*ch) {
+                    if(*ch == ' '){
+                        ch++;
+                        continue;
+                    }
+                    if(*ch == '\\'){
+                        ch++;
+                        if (*ch == 'n' || *ch == 'r' || *ch == 't') {
+                            ch++;
+                            continue;
+                        }
+                        throw SemanticError("invalid literal for int() with base 10: '"+ std::string(c) + "'", arg->base.loc);
+                    }
                     if (*ch == '.') {
                         throw SemanticError("invalid literal for int() with base 10: '"+ std::string(c) + "'", arg->base.loc);
                     }
                     if (*ch < '0' || *ch > '9') {
                         throw SemanticError("invalid literal for int() with base 10: '"+ std::string(c) + "'", arg->base.loc);
                     }
+                    str+=*ch;
                     ch++;
                 }
-                ival = std::stoi(c);
+                ival = std::stoi(str);
                 return (ASR::asr_t *)ASR::down_cast<ASR::expr_t>(ASR::make_IntegerConstant_t(al,
                                 loc, ival, to_type));
             }