diff --git a/desmume/src/NDSSystem.cpp b/desmume/src/NDSSystem.cpp
index 577304e07..f284ec72e 100644
--- a/desmume/src/NDSSystem.cpp
+++ b/desmume/src/NDSSystem.cpp
@@ -2235,9 +2235,12 @@ static void PrepareBiosARM7()
 	{
 		//read arm7 bios from inputfile and flag it if it succeeds
 		FILE *arm7inf = fopen(CommonSettings.ARM7BIOS,"rb");
-		if (fread(MMU.ARM7_BIOS,1,16384,arm7inf) == 16384)
-			NDS_ARM7.BIOS_loaded = true;
-		fclose(arm7inf);
+		if (arm7inf) 
+		{
+			if (fread(MMU.ARM7_BIOS,1,16384,arm7inf) == 16384)
+				NDS_ARM7.BIOS_loaded = true;
+			fclose(arm7inf);
+		}
 	}
 
 	//choose to use SWI emulation or routines from bios
@@ -2290,9 +2293,12 @@ static void PrepareBiosARM9()
 	{
 		//read arm9 bios from inputfile and flag it if it succeeds
 		FILE* arm9inf = fopen(CommonSettings.ARM9BIOS,"rb");
-		if (fread(MMU.ARM9_BIOS,1,4096,arm9inf) == 4096) 
-			NDS_ARM9.BIOS_loaded = true;
-		fclose(arm9inf);
+		if (arm9inf) 
+		{
+			if (fread(MMU.ARM9_BIOS,1,4096,arm9inf) == 4096) 
+				NDS_ARM9.BIOS_loaded = true;
+			fclose(arm9inf);
+		}
 	}
 
 	//choose to use SWI emulation or routines from bios