diff --git a/src/calculator.cpp b/src/calculator.cpp
index 6bf781b..1f215e5 100644
--- a/src/calculator.cpp
+++ b/src/calculator.cpp
@@ -23,7 +23,7 @@ enum SymbolType {
  */
 struct Symbol {
     SymbolType type = SymbolType::number;
-    double value = 0;
+    long double value = 0;
 };
 
 /**
@@ -317,7 +317,7 @@ Symbol calculateUsingStack(std::vector<Symbol>& _stack) {
 struct parseAndCalculateResult {
     int unmatchedParanthesis = 0;
     bool valid = true;
-    double value = 0;
+    long double value = 0;
 };
 
 /**
diff --git a/src/utils.cpp b/src/utils.cpp
index 7b4a001..30fee8d 100644
--- a/src/utils.cpp
+++ b/src/utils.cpp
@@ -12,7 +12,7 @@
  * @param precision what precision the stringed version should be
  * @return std::string the converted number
  */
-std::string doubleToString(const double& from, const int& precision = 10) {
+std::string doubleToString(const long double& from, const int& precision = 10) {
     std::stringstream theStream;
     if (precision < 0) theStream << std::setprecision(std::numeric_limits<double>::digits10+1);
     else theStream << std::setprecision(precision);