diff --git a/src/apps/showimage/ShowImageApp.cpp b/src/apps/showimage/ShowImageApp.cpp
index b62c6ffbb3..700284e809 100644
--- a/src/apps/showimage/ShowImageApp.cpp
+++ b/src/apps/showimage/ShowImageApp.cpp
@@ -31,7 +31,7 @@
 #undef B_TRANSLATE_CONTEXT
 #define B_TRANSLATE_CONTEXT "AboutWindow"
 
-extern const char* kApplicationSignature = "application/x-vnd.Haiku-ShowImage";
+const char* kApplicationSignature = "application/x-vnd.Haiku-ShowImage";
 
 
 ShowImageApp::ShowImageApp()