diff --git a/fastdoubleparser-dev/src/main/java/ch.randelshofer.fastdoubleparser/ch/randelshofer/fastdoubleparser/AbstractJavaFloatingPointBitsFromByteArray.java b/fastdoubleparser-dev/src/main/java/ch.randelshofer.fastdoubleparser/ch/randelshofer/fastdoubleparser/AbstractJavaFloatingPointBitsFromByteArray.java
index ca94f95..2723050 100644
--- a/fastdoubleparser-dev/src/main/java/ch.randelshofer.fastdoubleparser/ch/randelshofer/fastdoubleparser/AbstractJavaFloatingPointBitsFromByteArray.java
+++ b/fastdoubleparser-dev/src/main/java/ch.randelshofer.fastdoubleparser/ch/randelshofer/fastdoubleparser/AbstractJavaFloatingPointBitsFromByteArray.java
@@ -77,6 +77,7 @@ private long parseDecFloatLiteral(byte[] str, int index, int startIndex, int end
         int swarLimit = Math.min(endIndex - 4, 1 << 30);
         for (; index < endIndex; index++) {
             ch = str[index];
+            if (ch == '_') continue;
             int digit = (char) (ch - '0');
             if (digit < 10) {
                 // This might overflow, we deal with it later.