diff --git a/include/internal/data_type.h b/include/internal/data_type.h
index b10d8690..f4789711 100644
--- a/include/internal/data_type.h
+++ b/include/internal/data_type.h
@@ -241,9 +241,9 @@ namespace csv {
                 return DataType::CSV_NULL;
 
             bool ws_allowed = true,
-                neg_allowed = true,
                 dot_allowed = true,
                 digit_allowed = true,
+                is_negative = false,
                 has_digit = false,
                 prob_float = false;
 
@@ -268,12 +268,12 @@ namespace csv {
                     }
                     break;
                 case '-':
-                    if (!neg_allowed) {
+                    if (!ws_allowed) {
                         // Ex: '510-123-4567'
                         return DataType::CSV_STRING;
                     }
 
-                    neg_allowed = false;
+                    is_negative = true;
                     break;
                 case '.':
                     if (!dot_allowed) {
@@ -297,7 +297,7 @@ namespace csv {
 
                         return _process_potential_exponential(
                             in.substr(exponent_start_idx),
-                            neg_allowed ? integral_part + decimal_part : -(integral_part + decimal_part),
+                            is_negative ? -(integral_part + decimal_part) : integral_part + decimal_part,
                             out
                         );
                     }
@@ -331,7 +331,7 @@ namespace csv {
             if (has_digit) {
                 long double number = integral_part + decimal_part;
                 if (out) {
-                    *out = neg_allowed ? number : -number;
+                    *out = is_negative ? -number : number;
                 }
 
                 return prob_float ? DataType::CSV_DOUBLE : _determine_integral_type(number);
diff --git a/single_include/csv.hpp b/single_include/csv.hpp
index 9cebfc2b..da165928 100644
--- a/single_include/csv.hpp
+++ b/single_include/csv.hpp
@@ -5328,7 +5328,7 @@ namespace csv {
                     }
                     break;
                 case '-':
-                    if (!neg_allowed) {
+                    if (!ws_allowed) {
                         // Ex: '510-123-4567'
                         return DataType::CSV_STRING;
                     }
diff --git a/single_include_test/csv.hpp b/single_include_test/csv.hpp
index 9cebfc2b..da165928 100644
--- a/single_include_test/csv.hpp
+++ b/single_include_test/csv.hpp
@@ -5328,7 +5328,7 @@ namespace csv {
                     }
                     break;
                 case '-':
-                    if (!neg_allowed) {
+                    if (!ws_allowed) {
                         // Ex: '510-123-4567'
                         return DataType::CSV_STRING;
                     }
diff --git a/tests/test_data_type.cpp b/tests/test_data_type.cpp
index ff82369c..030e82d4 100644
--- a/tests/test_data_type.cpp
+++ b/tests/test_data_type.cpp
@@ -163,4 +163,10 @@ TEST_CASE("Parse Scientific Notation Malformed", "[sci_notation]") {
     SECTION("Butchered Parsing Attempt") {
         REQUIRE(data_type(butchered) == DataType::CSV_STRING);
     }
-}
\ No newline at end of file
+}
+
+TEST_CASE( "Parse numbers with dash as string", "[regression_double]" ) {
+  std::string s("510-123-4567");
+  long double out;
+  REQUIRE(data_type(s, &out) == DataType::CSV_STRING);
+}