diff --git a/src/kits/package/PackageInfo.cpp b/src/kits/package/PackageInfo.cpp
index 967cfc6b53..15e425859e 100644
--- a/src/kits/package/PackageInfo.cpp
+++ b/src/kits/package/PackageInfo.cpp
@@ -487,7 +487,7 @@ BPackageInfo::Parser::_ParseVersionValue(Token& word, BPackageVersion* value,
 			word.text.CopyInto(micro, secondDotPos + 1, word.text.Length());
 
 			int32 errorPos;
-			if (!_IsAlphaNumUnderscore(micro, "", &errorPos)) {
+			if (!_IsAlphaNumUnderscore(micro, ".", &errorPos)) {
 				throw ParseError("invalid character in micro version string",
 					word.pos + secondDotPos + 1 + errorPos);
 			}