diff --git a/data/evaluatto/src/main/java/io/github/sadellie/evaluatto/Expression.kt b/data/evaluatto/src/main/java/io/github/sadellie/evaluatto/Expression.kt
index 354e96d1..086b061b 100644
--- a/data/evaluatto/src/main/java/io/github/sadellie/evaluatto/Expression.kt
+++ b/data/evaluatto/src/main/java/io/github/sadellie/evaluatto/Expression.kt
@@ -218,7 +218,7 @@ class Expression(
         if (moveIfMatched(Token.Operator.power)) {
             val factor = parseFactor()
 
-            if (factor.compareTo(BigDecimal.ZERO) == 0) {
+            if (factor.compareTo(BigDecimal.ZERO) == 0 && expr.compareTo(BigDecimal.ZERO) == 0) {
                 throw ExpressionException.BadExpression()
             }
 
diff --git a/data/evaluatto/src/test/java/io/github/sadellie/evaluatto/ExpressionSimpleTest.kt b/data/evaluatto/src/test/java/io/github/sadellie/evaluatto/ExpressionSimpleTest.kt
index da4dc9a4..b49df833 100644
--- a/data/evaluatto/src/test/java/io/github/sadellie/evaluatto/ExpressionSimpleTest.kt
+++ b/data/evaluatto/src/test/java/io/github/sadellie/evaluatto/ExpressionSimpleTest.kt
@@ -143,7 +143,7 @@ class ExpressionSimpleTest {
     fun zeroExponent() = assertExpr("5^0", "1")
 
     @Test
-    fun negativeExponent() = assertExpr("5^-1", "0.2")
+    fun negativeExponent() = assertExpr("5^(-2)", "0.04")
 
     @Test
     fun trigonometricLimits() = assertExpr("sin(0)", "0")