diff --git a/localize.h b/localize.h
index bef1b62..cd58c4a 100644
--- a/localize.h
+++ b/localize.h
@@ -11,7 +11,7 @@ struct Localize {
     QString localizedStr;
 };
 
-QDataStream &operator<<(QDataStream &out, const Localize &localize) {
+inline QDataStream &operator<<(QDataStream &out, const Localize &localize) {
     out << localize.valuePtr << localize.namePtr;
 
     // Parse gsc contents
@@ -25,7 +25,7 @@ QDataStream &operator<<(QDataStream &out, const Localize &localize) {
     return out;
 }
 
-QDataStream &operator>>(QDataStream &in, Localize &localize) {
+inline QDataStream &operator>>(QDataStream &in, Localize &localize) {
     // Parse value and name pointers
     in >> localize.valuePtr >> localize.namePtr;
 
diff --git a/rawfile.h b/rawfile.h
index 6134e16..23bed60 100644
--- a/rawfile.h
+++ b/rawfile.h
@@ -13,7 +13,7 @@ struct RawFile {
     QString rawFileContents;
 };
 
-QDataStream &operator<<(QDataStream &out, const RawFile &rawFile) {
+inline QDataStream &operator<<(QDataStream &out, const RawFile &rawFile) {
     out << rawFile.gscNamePtr;
     out << rawFile.gscLength;
     out << rawFile.rawFilePathPtr;
@@ -29,7 +29,7 @@ QDataStream &operator<<(QDataStream &out, const RawFile &rawFile) {
     return out;
 }
 
-QDataStream &operator>>(QDataStream &in, RawFile &rawFile) {
+inline QDataStream &operator>>(QDataStream &in, RawFile &rawFile) {
     in >> rawFile.gscNamePtr;
     in >> rawFile.gscLength;
     in >> rawFile.rawFilePathPtr;
diff --git a/zone.h b/zone.h
index ea4b250..fb860c4 100644
--- a/zone.h
+++ b/zone.h
@@ -27,7 +27,7 @@ struct Zone {
     QVector<ASSET_TYPE> assetTypes;
 };
 
-QDataStream &operator<<(QDataStream &out, const Zone &zone) {
+inline QDataStream &operator<<(QDataStream &out, const Zone &zone) {
     // Write adjusted fastfile size
     out << zone.zoneFileSize - 36;
     // Write unknowns 1-8
@@ -60,7 +60,7 @@ QDataStream &operator<<(QDataStream &out, const Zone &zone) {
     return out;
 }
 
-QDataStream &operator>>(QDataStream &in, Zone &zone) {
+inline QDataStream &operator>>(QDataStream &in, Zone &zone) {
     // Parse file size
     in >> zone.zoneFileSize;
     zone.zoneFileSize += 36;