diff --git a/features/location/api/src/main/kotlin/io/element/android/features/location/api/internal/MapTilerTileServerStyleUriBuilder.kt b/features/location/api/src/main/kotlin/io/element/android/features/location/api/internal/MapTilerTileServerStyleUriBuilder.kt
index 054805d1ab..dd9d99fa04 100644
--- a/features/location/api/src/main/kotlin/io/element/android/features/location/api/internal/MapTilerTileServerStyleUriBuilder.kt
+++ b/features/location/api/src/main/kotlin/io/element/android/features/location/api/internal/MapTilerTileServerStyleUriBuilder.kt
@@ -29,14 +29,15 @@ internal class MapTilerTileServerStyleUriBuilder(
         customMapStyleUrl: String?,
         darkMode: Boolean,
     ): String {
-        return buildString {
-            if (customMapStyleUrl.isNullOrBlank()) {
-                val mapId = if (darkMode) darkMapId else lightMapId
-                append("$baseUrl/$mapId/style.json")
-            } else {
-                append(customMapStyleUrl)
-            }
-            append("?key=$apiKey")
+        return if (customMapStyleUrl.isNullOrBlank()) {
+            val mapId = if (darkMode) darkMapId else lightMapId
+            "$baseUrl/$mapId/style.json?key=$apiKey"
+        } else {
+            // A custom style url comes from the homeserver .well-known and is expected to be complete:
+            // it already carries the operator's own credentials, if any. Appending our api key to it
+            // adds a second query string and breaks the request.
+            // See https://github.com/element-hq/element-x-android/issues/7289
+            customMapStyleUrl
         }
     }
 }
diff --git a/features/location/api/src/test/kotlin/io/element/android/features/location/api/internal/MapTilerTileServerStyleUriBuilderTest.kt b/features/location/api/src/test/kotlin/io/element/android/features/location/api/internal/MapTilerTileServerStyleUriBuilderTest.kt
index 2e07204594..addc71c3b9 100644
--- a/features/location/api/src/test/kotlin/io/element/android/features/location/api/internal/MapTilerTileServerStyleUriBuilderTest.kt
+++ b/features/location/api/src/test/kotlin/io/element/android/features/location/api/internal/MapTilerTileServerStyleUriBuilderTest.kt
@@ -46,7 +46,7 @@ class MapTilerTileServerStyleUriBuilderTest {
                 customMapStyleUrl = "https://custom.url/style.json",
                 darkMode = false,
             )
-        ).isEqualTo("https://custom.url/style.json?key=anApiKey")
+        ).isEqualTo("https://custom.url/style.json")
     }
 
     @Test
@@ -56,6 +56,36 @@ class MapTilerTileServerStyleUriBuilderTest {
                 customMapStyleUrl = "https://custom.url/style.json",
                 darkMode = true,
             )
-        ).isEqualTo("https://custom.url/style.json?key=anApiKey")
+        ).isEqualTo("https://custom.url/style.json")
+    }
+
+    @Test
+    fun `custom map uri with its own api key is not altered`() {
+        assertThat(
+            builder.build(
+                customMapStyleUrl = "https://api.maptiler.com/maps/streets-v2/style.json?key=anOperatorKey",
+                darkMode = false,
+            )
+        ).isEqualTo("https://api.maptiler.com/maps/streets-v2/style.json?key=anOperatorKey")
+    }
+
+    @Test
+    fun `custom map uri with an existing query is not altered`() {
+        assertThat(
+            builder.build(
+                customMapStyleUrl = "https://self.hosted/style.json?foo=bar",
+                darkMode = true,
+            )
+        ).isEqualTo("https://self.hosted/style.json?foo=bar")
+    }
+
+    @Test
+    fun `blank custom map uri falls back to the built-in style`() {
+        assertThat(
+            builder.build(
+                customMapStyleUrl = "  ",
+                darkMode = false,
+            )
+        ).isEqualTo("https://base.url/aLightMapId/style.json?key=anApiKey")
     }
 }