diff --git a/jni/NativeFormats/fbreader/src/formats/fb2/FB2BookReader.cpp b/jni/NativeFormats/fbreader/src/formats/fb2/FB2BookReader.cpp
index ac610ffc6..76af983cc 100644
--- a/jni/NativeFormats/fbreader/src/formats/fb2/FB2BookReader.cpp
+++ b/jni/NativeFormats/fbreader/src/formats/fb2/FB2BookReader.cpp
@@ -212,8 +212,8 @@ void FB2BookReader::startElementHandler(int tag, const char **xmlattributes) {
 				ref = attributeValue(xmlattributes, myBrokenHrefPredicate);
 			}
 			const char *vOffset = attributeValue(xmlattributes, "voffset");
-			char offset = (vOffset != 0) ? atoi(vOffset) : 0;
-			if ((ref != 0) && (*ref == '#')) {
+			char offset = vOffset != 0 ? std::atoi(vOffset) : 0;
+			if (ref != 0 && *ref == '#') {
 				++ref;
 				const bool isCoverImage =
 					myParagraphsBeforeBodyNumber ==
diff --git a/jni/NativeFormats/fbreader/src/formats/fb2/FB2Reader.cpp b/jni/NativeFormats/fbreader/src/formats/fb2/FB2Reader.cpp
index 3f993ba13..4a10d9612 100644
--- a/jni/NativeFormats/fbreader/src/formats/fb2/FB2Reader.cpp
+++ b/jni/NativeFormats/fbreader/src/formats/fb2/FB2Reader.cpp
@@ -81,7 +81,7 @@ static const FB2Reader::Tag TAGS[] = {
 
 int FB2Reader::tag(const char *name) {
 	for (int i = 0; ; ++i) {
-		if ((TAGS[i].tagName == 0) || (strcmp(name, TAGS[i].tagName) == 0)) {
+		if (TAGS[i].tagName == 0 || std::strcmp(name, TAGS[i].tagName) == 0) {
 			return TAGS[i].tagCode;
 		}
 	}