diff --git a/src/g_level.h b/src/g_level.h
index 0cd366798..ec867c226 100644
--- a/src/g_level.h
+++ b/src/g_level.h
@@ -52,7 +52,7 @@ class FScanner;
 #define GCC_YSEG
 #else
 #define MSVC_YSEG
-#define GCC_YSEG __attribute__((section(SECTION_YREG)))
+#define GCC_YSEG __attribute__((section(SECTION_YREG))) __attribute__((used))
 #endif
 
 struct FIntermissionDescriptor;
diff --git a/src/thingdef/thingdef.h b/src/thingdef/thingdef.h
index c388a8544..5225b787a 100644
--- a/src/thingdef/thingdef.h
+++ b/src/thingdef/thingdef.h
@@ -266,11 +266,11 @@ enum EDefinitionType
 #define GCC_MSEG
 #else
 #define MSVC_ASEG
-#define GCC_ASEG __attribute__((section(SECTION_AREG)))
+#define GCC_ASEG __attribute__((section(SECTION_AREG))) __attribute__((used))
 #define MSVC_PSEG
-#define GCC_PSEG __attribute__((section(SECTION_GREG)))
+#define GCC_PSEG __attribute__((section(SECTION_GREG))) __attribute__((used))
 #define MSVC_MSEG
-#define GCC_MSEG __attribute__((section(SECTION_MREG)))
+#define GCC_MSEG __attribute__((section(SECTION_MREG))) __attribute__((used))
 #endif