diff --git a/src/formula/TimeBoundedOperator.h b/src/formula/TimeBoundedOperator.h
index 779d346e6..f0f443f97 100644
--- a/src/formula/TimeBoundedOperator.h
+++ b/src/formula/TimeBoundedOperator.h
@@ -8,6 +8,8 @@
 #ifndef TIMEBOUNDEDOPERATOR_H_
 #define TIMEBOUNDEDOPERATOR_H_
 
+#include <limits>
+
 #include "AbstractPathFormula.h"
 #include "exceptions/InvalidArgumentException.h"
 
@@ -85,11 +87,16 @@ public:
 	 * 			May be used in subclasses to simplify string output.
 	 */
 	virtual std::string toString() const {
-		std::string result = "[";
-		result += std::to_string(lowerBound);
-		result += ",";
-		result += std::to_string(upperBound);
-		result += "]";
+		std::string result = "";
+		if (upperBound == std::numeric_limits<double>::infinity()) {
+			result = ">=" + std::to_string(lowerBound);
+		} else {
+			result = "[";
+			result += std::to_string(lowerBound);
+			result += ",";
+			result += std::to_string(upperBound);
+			result += "]";
+		}
 		return result;
 	}
 
diff --git a/test/parser/CslParserTest.cpp b/test/parser/CslParserTest.cpp
index 7b3a09cee..7bf11fcdb 100644
--- a/test/parser/CslParserTest.cpp
+++ b/test/parser/CslParserTest.cpp
@@ -121,10 +121,7 @@ TEST(CslParserTest, parseComplexFormulaTest) {
 
 	ASSERT_NE(cslParser->getFormula(), nullptr);
 
-	//NOTE: This test case is dependent on the string output of the double value infinity.
-	//		  In g++ and clang++ on Linux, it is "inf". If some compiler (or library) uses a different output, please
-	//		  notify me and I will restructure this test case.
-	ASSERT_EQ("(S <= 0.500000 [P <= 0.500000 [a U c]] & (P > 0.500000 [G b] | !P < 0.400000 [G P > 0.900000 [F[7.000000,inf] (a & b)]]))", cslParser->getFormula()->toString());
+	ASSERT_EQ("(S <= 0.500000 [P <= 0.500000 [a U c]] & (P > 0.500000 [G b] | !P < 0.400000 [G P > 0.900000 [F>=7.000000 (a & b)]]))", cslParser->getFormula()->toString());
 	delete cslParser->getFormula();
 	delete cslParser;