diff --git a/src/libcamera/pipeline/ipu3/ipu3.cpp b/src/libcamera/pipeline/ipu3/ipu3.cpp
index b490a801a9c4..1e114ca7ed10 100644
--- a/src/libcamera/pipeline/ipu3/ipu3.cpp
+++ b/src/libcamera/pipeline/ipu3/ipu3.cpp
@@ -1532,7 +1532,8 @@ int CIO2Device::allocateBuffers()
 
 void CIO2Device::freeBuffers()
 {
-	availableBuffers_ = {};
+	/* The default std::queue constructor is explicit with gcc 5 and 6. */
+	availableBuffers_ = std::queue<FrameBuffer *>{};
 
 	buffers_.clear();