diff --git a/src/ooxml/java/org/apache/poi/openxml4j/opc/OPCPackage.java b/src/ooxml/java/org/apache/poi/openxml4j/opc/OPCPackage.java
index 3eb9b6df6..b1b11b512 100644
--- a/src/ooxml/java/org/apache/poi/openxml4j/opc/OPCPackage.java
+++ b/src/ooxml/java/org/apache/poi/openxml4j/opc/OPCPackage.java
@@ -429,6 +429,7 @@ public abstract class OPCPackage implements RelationshipSource, Closeable {
 		if (this.contentTypeManager == null) {
 		    logger.log(POILogger.WARN,
 		            "Unable to call close() on a package that hasn't been fully opened yet");
+			revert();
 		    return;
 		}
 
diff --git a/src/ooxml/java/org/apache/poi/openxml4j/opc/internal/ZipHelper.java b/src/ooxml/java/org/apache/poi/openxml4j/opc/internal/ZipHelper.java
index 56536d238..632d2af26 100644
--- a/src/ooxml/java/org/apache/poi/openxml4j/opc/internal/ZipHelper.java
+++ b/src/ooxml/java/org/apache/poi/openxml4j/opc/internal/ZipHelper.java
@@ -247,8 +247,11 @@ public final class ZipHelper {
         
         // Peek at the first few bytes to sanity check
         FileInputStream input = new FileInputStream(file);
-        verifyZipHeader(input);
-        input.close();
+        try {
+            verifyZipHeader(input);
+        } finally {
+            input.close();
+        }
 
         // Open as a proper zip file
         return new ZipSecureFile(file);