diff --git a/src/main/kotlin/io/bazel/kotlin/builder/utils/jars/SourceJarCreator.kt b/src/main/kotlin/io/bazel/kotlin/builder/utils/jars/SourceJarCreator.kt
index 9419a79be..7ac7e5692 100644
--- a/src/main/kotlin/io/bazel/kotlin/builder/utils/jars/SourceJarCreator.kt
+++ b/src/main/kotlin/io/bazel/kotlin/builder/utils/jars/SourceJarCreator.kt
@@ -35,7 +35,7 @@ class SourceJarCreator(
     private const val BL = """\p{Blank}*"""
     private const val COM_BL = """$BL(?:/\*[^\n]*\*/$BL)*"""
     private val PKG_PATTERN: Pattern =
-      Pattern.compile("""^${COM_BL}package$COM_BL([a-zA-Z1-9._]+)$COM_BL(?:;?.*)$""")
+      Pattern.compile("""^${COM_BL}package$COM_BL([a-zA-Z0-9._]+)$COM_BL(?:;?.*)$""")
 
     @JvmStatic
     fun extractPackage(line: String): String? =
diff --git a/src/test/kotlin/io/bazel/kotlin/builder/utils/jars/SourceJarCreatorTest.java b/src/test/kotlin/io/bazel/kotlin/builder/utils/jars/SourceJarCreatorTest.java
index 8e5b39191..fbaa6c5f7 100644
--- a/src/test/kotlin/io/bazel/kotlin/builder/utils/jars/SourceJarCreatorTest.java
+++ b/src/test/kotlin/io/bazel/kotlin/builder/utils/jars/SourceJarCreatorTest.java
@@ -49,4 +49,16 @@ public void testPackageNameRegex() {
                     subj.that(pkg).isEqualTo(expectedPackage);
                 });
     }
+
+    @Test
+    public void testPackageNameRegexWithZero() {
+        cases.forEach(
+                (testCase) -> {
+                    testCase = testCase.replace("some1", "some0");
+                    String pkg = SourceJarCreator.Companion.extractPackage(testCase);
+                    StandardSubjectBuilder subj = assertWithMessage("positive test case: " + testCase);
+                    subj.that(pkg).isNotNull();
+                    subj.that(pkg).isEqualTo("iO.some0.package");
+                });
+    }
 }