diff --git a/sci-calculators/qalculate/additional-files/qalculate_qt.rdef.in b/sci-calculators/qalculate/additional-files/qalculate_qt.rdef.in
index e376bf57f..37bb0e333 100644
--- a/sci-calculators/qalculate/additional-files/qalculate_qt.rdef.in
+++ b/sci-calculators/qalculate/additional-files/qalculate_qt.rdef.in
@@ -1,5 +1,5 @@
 
-resource app_flags B_SIGLE_LAUNCH;
+resource app_flags B_SINGLE_LAUNCH;
 
 resource app_version {
 	major  = @MAJOR@,