diff --git a/lib/Excel/Writer/XLSX.pm b/lib/Excel/Writer/XLSX.pm
index 11fd11b7..f1829fed 100644
--- a/lib/Excel/Writer/XLSX.pm
+++ b/lib/Excel/Writer/XLSX.pm
@@ -6624,6 +6624,7 @@ The following list is taken from the MS XLSX extensions documentation on future
     _xlfn.ACOTH
     _xlfn.AGGREGATE
     _xlfn.ARABIC
+    _xlfn.ARRAYTOTEXT
     _xlfn.BASE
     _xlfn.BETA.DIST
     _xlfn.BETA.INV
@@ -6643,6 +6644,7 @@ The following list is taken from the MS XLSX extensions documentation on future
     _xlfn.CHISQ.INV.RT
     _xlfn.CHISQ.TEST
     _xlfn.COMBINA
+    _xlfn.CONCAT
     _xlfn.CONFIDENCE.NORM
     _xlfn.CONFIDENCE.T
     _xlfn.COT
@@ -6678,6 +6680,8 @@ The following list is taken from the MS XLSX extensions documentation on future
     _xlfn.GAUSS
     _xlfn.HYPGEOM.DIST
     _xlfn.IFNA
+    _xlfn.IFS
+    _xlfn.IMAGE
     _xlfn.IMCOSH
     _xlfn.IMCOT
     _xlfn.IMCSC
@@ -6688,9 +6692,13 @@ The following list is taken from the MS XLSX extensions documentation on future
     _xlfn.IMTAN
     _xlfn.ISFORMULA
     ISO.CEILING
+    _xlfn.ISOMITTED
     _xlfn.ISOWEEKNUM
+    _xlfn.LET
     _xlfn.LOGNORM.DIST
     _xlfn.LOGNORM.INV
+    _xlfn.MAXIFS
+    _xlfn.MINIFS
     _xlfn.MODE.MULT
     _xlfn.MODE.SNGL
     _xlfn.MUNIT
@@ -6728,13 +6736,18 @@ The following list is taken from the MS XLSX extensions documentation on future
     _xlfn.T.INV
     _xlfn.T.INV.2T
     _xlfn.T.TEST
+    _xlfn.TEXTAFTER
+    _xlfn.TEXTBEFORE
+    _xlfn.TEXTJOIN
     _xlfn.UNICHAR
     _xlfn.UNICODE
+    _xlfn.VALUETOTEXT
     _xlfn.VAR.P
     _xlfn.VAR.S
     _xlfn.WEBSERVICE
     _xlfn.WEIBULL.DIST
     WORKDAY.INTL
+    _xlfn.XMATCH
     _xlfn.XOR
     _xlfn.Z.TEST
 
diff --git a/lib/Excel/Writer/XLSX/Worksheet.pm b/lib/Excel/Writer/XLSX/Worksheet.pm
index 7dac6d50..b3f36049 100644
--- a/lib/Excel/Writer/XLSX/Worksheet.pm
+++ b/lib/Excel/Writer/XLSX/Worksheet.pm
@@ -2940,6 +2940,7 @@ sub _prepare_formula {
     $formula =~ s/\b(HYPGEOM.DIST\()/_xlfn.$1/g;
     $formula =~ s/\b(IFNA\()/_xlfn.$1/g;
     $formula =~ s/\b(IFS\()/_xlfn.$1/g;
+    $formula =~ s/\b(IMAGE\()/_xlfn.$1/g;
     $formula =~ s/\b(IMCOSH\()/_xlfn.$1/g;
     $formula =~ s/\b(IMCOT\()/_xlfn.$1/g;
     $formula =~ s/\b(IMCSCH\()/_xlfn.$1/g;
@@ -3086,8 +3087,8 @@ sub write_formula {
     # Check that row and col are valid and store max and min values
     return -2 if $self->_check_dimensions( $row, $col );
 
-    # Remove the = sign if it exists.
-    $formula =~ s/^=//;
+    # Expand out the formula.
+    $formula = $self->_prepare_formula($formula);
 
     # Write previous row if in in-line string optimization mode.
     if ( $self->{_optimization} == 1 && $row > $self->{_previous_row} ) {
diff --git a/t/worksheet/sub_prepare_formula.t b/t/worksheet/sub_prepare_formula.t
index 3c92726b..54bed9fc 100644
--- a/t/worksheet/sub_prepare_formula.t
+++ b/t/worksheet/sub_prepare_formula.t
@@ -9,7 +9,7 @@ use strict;
 use warnings;
 use Excel::Writer::XLSX::Worksheet;
 
-use Test::More tests => 179;
+use Test::More tests => 180;
 
 
 ###############################################################################
@@ -98,6 +98,7 @@ my @testcases = (
     ['F.INV()', '_xlfn.F.INV()'],
     ['GAMMA()', '_xlfn.GAMMA()'],
     ['GAUSS()', '_xlfn.GAUSS()'],
+    ['IMAGE()', '_xlfn.IMAGE()'],
     ['IMCOT()', '_xlfn.IMCOT()'],
     ['IMCSC()', '_xlfn.IMCSC()'],
     ['IMSEC()', '_xlfn.IMSEC()'],