diff --git a/native/src/androidNativeArm32Main/kotlin/moe/tarsin/ehviewer/PlatformTypes.kt b/native/src/androidNativeArm32Main/kotlin/moe/tarsin/ehviewer/PlatformTypes.kt
index f0d19844f..c109357e7 100644
--- a/native/src/androidNativeArm32Main/kotlin/moe/tarsin/ehviewer/PlatformTypes.kt
+++ b/native/src/androidNativeArm32Main/kotlin/moe/tarsin/ehviewer/PlatformTypes.kt
@@ -2,6 +2,9 @@ package moe.tarsin.ehviewer
 
 import platform.posix.size_t
 
+private val MAX_ALLOWED_CONVERT_VALUE = size_t.MAX_VALUE.toLong()
+
 actual fun Long.tosize_t(): size_t {
+    check(this <= MAX_ALLOWED_CONVERT_VALUE)
     return toUInt()
 }
diff --git a/native/src/androidNativeX86Main/kotlin/moe/tarsin/ehviewer/PlatformTypes.kt b/native/src/androidNativeX86Main/kotlin/moe/tarsin/ehviewer/PlatformTypes.kt
index f0d19844f..c109357e7 100644
--- a/native/src/androidNativeX86Main/kotlin/moe/tarsin/ehviewer/PlatformTypes.kt
+++ b/native/src/androidNativeX86Main/kotlin/moe/tarsin/ehviewer/PlatformTypes.kt
@@ -2,6 +2,9 @@ package moe.tarsin.ehviewer
 
 import platform.posix.size_t
 
+private val MAX_ALLOWED_CONVERT_VALUE = size_t.MAX_VALUE.toLong()
+
 actual fun Long.tosize_t(): size_t {
+    check(this <= MAX_ALLOWED_CONVERT_VALUE)
     return toUInt()
 }