diff --git a/core/math/expression.cpp b/core/math/expression.cpp
index b447d098872..0ddac9744ef 100644
--- a/core/math/expression.cpp
+++ b/core/math/expression.cpp
@@ -361,6 +361,7 @@ Error Expression::_get_token(Token &r_token) {
 									is_float = true;
 								} else if (c == 'e') {
 									reading = READING_EXP;
+									is_float = true;
 								} else {
 									reading = READING_DONE;
 								}
@@ -397,9 +398,6 @@ Error Expression::_get_token(Token &r_token) {
 									exp_beg = true;
 
 								} else if ((c == '-' || c == '+') && !exp_sign && !exp_beg) {
-									if (c == '-') {
-										is_float = true;
-									}
 									exp_sign = true;
 
 								} else {
diff --git a/tests/core/math/test_expression.h b/tests/core/math/test_expression.h
index 5a894b20f33..6e3be541b04 100644
--- a/tests/core/math/test_expression.h
+++ b/tests/core/math/test_expression.h
@@ -137,7 +137,7 @@ TEST_CASE("[Expression] Scientific notation") {
 			expression.parse("2e5") == OK,
 			"The expression should parse successfully.");
 	CHECK_MESSAGE(
-			Math::is_equal_approx(double(expression.execute()), 25),
+			Math::is_equal_approx(double(expression.execute()), 2e5),
 			"The expression should return the expected result.");
 
 	CHECK_MESSAGE(