diff --git a/inc/sc_agenda.php b/inc/sc_agenda.php
index 8c2514008780d8c71f590f1437c432eb0ebf67f8..6308ec9cfb2ec58ee9d282186e85b7b2e8a8a5d3 100644
--- a/inc/sc_agenda.php
+++ b/inc/sc_agenda.php
@@ -684,7 +684,7 @@ function http_calendrier_ics($annee, $mois, $jour, $echelle, $partie_cal, $large
 	[$dimheure, $dimjour, $fontsize, $padding] =
 	  calendrier_echelle($debut, $fin, $echelle);
 	$size = sprintf('%0.2f', DEFAUT_TAILLE_HEURE + (10 / $echelle));
-	$style .= "height:${dimjour}px;font-size:${size}em;";
+	$style .= "height:{$dimjour}px;font-size:{$size}em;";
 	$date = date('Ymd', mktime(0, 0, 0, $mois, $jour, $annee));
 
 	$avecheure = !isset($evt[1][$date]) ? '' : http_calendrier_ics_div($evt[1][$date], $date, $debut, $fin, $dimheure, $dimjour, $echelle, $largeur, $padding);
@@ -798,7 +798,7 @@ $lieu = '';
 
 		$width = $largeur - ($padding << 1) - DEFAUT_DECALE;
 		$fontsize = sprintf('%0.2f', 1 + (10 / $echelle));
-		$style = "z-index:${i};${spip_lang_left}:${decale}em;top:${haut}px;height:${hauteur}px;width:${width}px;font-size:${fontsize}em;padding:${padding}px;$bordure";
+		$style = "z-index:{$i};{$spip_lang_left}:{$decale}em;top:{$haut}px;height:{$hauteur}px;width:{$width}px;font-size:{$fontsize}em;padding:{$padding}px;$bordure";
 		$total .= "\n<div class='$colors calendrier-evt' style='$style'
 	onmouseover=\"this.style.zIndex=" . $tous . '"
 	onmouseout="this.style.zIndex=' . $i . '">' .
@@ -825,11 +825,11 @@ function http_calendrier_ics_grille($debut, $fin, $dimheure, $dimjour, $echelle)
 	for ($i = $debut; $i < $fin; $i++) {
 		$k = "$i:00";
 		$n = calendrier_top($k, $debut, $fin, $dimheure, $dimjour);
-		$total .= "\n<span style='$spip_lang_left:0;top:${n}px;'>$k</span>";
+		$total .= "\n<span style='$spip_lang_left:0;top:{$n}px;'>$k</span>";
 		for ($j = 1; $j < $slice; $j++) {
 			$k = $i . ':' . sprintf('%02d', floor(($j * 60) / $slice));
 			$n = calendrier_top($k, $debut, $fin, $dimheure, $dimjour);
-			$total .= "\n<span class='calendrier-jour-m' style='$spip_lang_left:0;top:${n}px;'>$k</span>";
+			$total .= "\n<span class='calendrier-jour-m' style='$spip_lang_left:0;top:{$n}px;'>$k</span>";
 		}
 	}
 
@@ -839,8 +839,8 @@ function http_calendrier_ics_grille($debut, $fin, $dimheure, $dimjour, $echelle)
 
 	return "\n<span style='border:0;$spip_lang_left:0;top:2px;'>0:00</span>" .
 		$total .
-		"\n<span style='$spip_lang_left:0;top:${n}px;'>$fin:00</span>" .
-		"\n<span style='border:0;$spip_lang_left:0;top:${c}px;'>23:59</span>";
+		"\n<span style='$spip_lang_left:0;top:{$n}px;'>$fin:00</span>" .
+		"\n<span style='border:0;$spip_lang_left:0;top:{$c}px;'>23:59</span>";
 }
 
 /// si la largeur le permet, les evenements sans duree,
@@ -875,7 +875,7 @@ function http_calendrier_ics_trois($evt, $largeur, $dimjour, $echelle, $border)
 $pos = 0;
 	}
 
-	return "\n<div style='position: relative; z-index: 2; top: ${pos}px; margin-$spip_lang_left: " . $largeur . "px'>$res</div>";
+	return "\n<div style='position: relative; z-index: 2; top: {$pos}px; margin-$spip_lang_left: " . $largeur . "px'>$res</div>";
 }
 
 // https://code.spip.net/@http_calendrier_ics_titre