diff --git a/build/jam/OptionalPackages b/build/jam/OptionalPackages
index 737a9e9b4d..bb9ad0580e 100644
--- a/build/jam/OptionalPackages
+++ b/build/jam/OptionalPackages
@@ -1299,7 +1299,7 @@ if [ IsOptionalHaikuImagePackageAdded ICU ] {
 		}
 	} else if $(TARGET_ARCH) = arm {
 		InstallOptionalHaikuImagePackage $(HAIKU_ICU_ARM_PACKAGE)
-			: $(baseURL)/(HAIKU_ICU_ARM_PACKAGE)
+			: $(baseURL)/$(HAIKU_ICU_ARM_PACKAGE)
 			: system lib ;
 	} else if $(TARGET_ARCH) = x86_64 {
 		InstallOptionalHaikuImagePackage $(HAIKU_ICU_X86_64_PACKAGE)