diff --git a/src/libcamera/formats.cpp b/src/libcamera/formats.cpp
index 447e623803c7..c11fbd730c8e 100644
--- a/src/libcamera/formats.cpp
+++ b/src/libcamera/formats.cpp
@@ -987,7 +987,7 @@ unsigned int PixelFormatInfo::stride(unsigned int width, unsigned int plane,
 		return 0;
 	}
 
-	if (plane > planes.size() || !planes[plane].bytesPerGroup) {
+	if (plane >= planes.size() || !planes[plane].bytesPerGroup) {
 		LOG(Formats, Warning) << "Invalid plane index, stride is zero";
 		return 0;
 	}