diff --git a/CHANGELOG.md b/CHANGELOG.md
index 3546d92e..f4089b37 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -64,6 +64,7 @@
   ("permanently reset") instead of `2` ("reset") for DEC private
   modes that are known but unsupported.
 * Set `PWD` environment variable in the slave process ([#1179][1179]).
+* DPI is now forced to 96 when found to be unreasonably high.
 
 [1166]: https://codeberg.org/dnkl/foot/issues/1166
 [1179]: https://codeberg.org/dnkl/foot/issues/1179
@@ -94,10 +95,12 @@
 * Background transparency being applied to the text "behind" the
   cursor. Only applies to block cursor using inversed fg/bg
   colors. ([#1205][1205]).
+* Crash when monitor’s physical size is "too small" ([#1209][1209]).
 
 [1173]: https://codeberg.org/dnkl/foot/issues/1173
 [1190]: https://codeberg.org/dnkl/foot/issues/1190
 [1205]: https://codeberg.org/dnkl/foot/issues/1205
+[1209]: https://codeberg.org/dnkl/foot/issues/1209
 
 
 ### Security
diff --git a/wayland.c b/wayland.c
index fb103ad1..e48d59aa 100644
--- a/wayland.c
+++ b/wayland.c
@@ -370,8 +370,8 @@ output_update_ppi(struct monitor *mon)
     if (mon->dim.mm.width <= 0 || mon->dim.mm.height <= 0)
         return;
 
-    int x_inches = mon->dim.mm.width * 0.03937008;
-    int y_inches = mon->dim.mm.height * 0.03937008;
+    double x_inches = mon->dim.mm.width * 0.03937008;
+    double y_inches = mon->dim.mm.height * 0.03937008;
 
     mon->ppi.real.x = mon->dim.px_real.width / x_inches;
     mon->ppi.real.y = mon->dim.px_real.height / y_inches;
@@ -407,8 +407,16 @@ output_update_ppi(struct monitor *mon)
     mon->ppi.scaled.x = scaled_width / x_inches;
     mon->ppi.scaled.y = scaled_height / y_inches;
 
-    float px_diag = sqrt(pow(scaled_width, 2) + pow(scaled_height, 2));
+    double px_diag = sqrt(pow(scaled_width, 2) + pow(scaled_height, 2));
     mon->dpi = px_diag / mon->inch * mon->scale;
+
+    if (mon->dpi > 1000) {
+        if (mon->name != NULL) {
+            LOG_WARN("%s: DPI=%f is unreasonable, using 96 instead",
+                     mon->name, mon->dpi);
+        }
+        mon->dpi = 96;
+    }
 }
 
 static void