diff --git a/papaparse.js b/papaparse.js
index 3ce39621..b9e41d08 100755
--- a/papaparse.js
+++ b/papaparse.js
@@ -377,8 +377,10 @@ License: MIT
 				_escapedQuote = _config.escapeChar + _quoteChar;
 			}
 
-			if (typeof _config.escapeFormulae === 'boolean' || _config.escapeFormulae instanceof RegExp) {
-				_escapeFormulae = _config.escapeFormulae instanceof RegExp ? _config.escapeFormulae : /^[=+\-@\t\r].*$/;
+			if (_config.escapeFormulae instanceof RegExp) {
+				_escapeFormulae = _config.escapeFormulae;
+			} else if (typeof _config.escapeFormulae === 'boolean' && _config.escapeFormulae) {
+				_escapeFormulae =  /^[=+\-@\t\r].*$/;
 			}
 		}