diff --git a/src/common/filesystem/file_zip.cpp b/src/common/filesystem/file_zip.cpp
index c8977629b3..bd0d76624f 100644
--- a/src/common/filesystem/file_zip.cpp
+++ b/src/common/filesystem/file_zip.cpp
@@ -222,7 +222,7 @@ bool FZipFile::Open(bool quiet, LumpFilterInfo* filter)
 			return false;
 		}
 		
-		NumLumps = info.NumEntries;
+		NumLumps = (uint32_t)info.NumEntries;
 		dirsize = info.DirectorySize;
 		DirectoryOffset = info.DirectoryOffset;
 	}
@@ -521,7 +521,7 @@ int FZipLump::GetFileOffset()
 {
 	if (Method != METHOD_STORED) return -1;
 	if (NeedFileStart) SetLumpAddress();
-	return Position;
+	return (int)Position;
 }
 
 //==========================================================================
diff --git a/src/common/objects/dobjgc.cpp b/src/common/objects/dobjgc.cpp
index e407d3d774..8664ac541b 100644
--- a/src/common/objects/dobjgc.cpp
+++ b/src/common/objects/dobjgc.cpp
@@ -277,7 +277,7 @@ void MarkArray(DObject **obj, size_t count)
 
 static size_t CalcStepSize()
 {
-	int time_passed = CheckTime - LastCollectTime;
+	int time_passed = int(CheckTime - LastCollectTime);
 	auto alloc = min(LastCollectAlloc, Estimate);
 	size_t bytes_gained = AllocBytes > alloc ? AllocBytes - alloc : 0;
 	return (StepMul > 0 && time_passed > 0)
@@ -390,7 +390,7 @@ static size_t SingleStep()
 	case GCS_Finalize:
 		State = GCS_Pause;		// end collection
 		LastCollectAlloc = AllocBytes;
-		LastCollectTime = CheckTime;
+		LastCollectTime = (int)CheckTime;
 		return 0;
 
 	default: