diff --git a/_resources/port1.0/group/qt6_info-1.0.tcl b/_resources/port1.0/group/qt6_info-1.0.tcl
index 4e7e2e4f5256a..cc768d2f6b8d6 100644
--- a/_resources/port1.0/group/qt6_info-1.0.tcl
+++ b/_resources/port1.0/group/qt6_info-1.0.tcl
@@ -37,7 +37,7 @@ namespace eval  qt6             {}
 set qt6::available_versions {
     qt6     {6.8   {24 23}}
     qt67    {6.7   {24 23 22 21}}
-    qt64    {6.4   {24 23 22 21 20 19}}
+    qt64    {6.4   {24 23 22 21 20 19 18}}
 }
 
 ####################################################################################################################################
diff --git a/aqua/qt64/Portfile b/aqua/qt64/Portfile
index e6da876898b62..ce21e678ecdd8 100644
--- a/aqua/qt64/Portfile
+++ b/aqua/qt64/Portfile
@@ -8,7 +8,7 @@ PortGroup                   compiler_blacklist_versions 1.0
 name                        qt64
 
 categories                  aqua
-platforms                   {macosx >= 19} ; # upon change, please update qt6 PG
+platforms                   {macosx >= 18} ; # upon change, please update qt6 PG
 maintainers                 {mcalhoun @MarcusCalhoun-Lopez} openmaintainer
 
 # for OpenSSLException, see source and header files in src/network/ssl of qtbase