diff --git a/arch/arm/core/cortex_m/vector_table.S b/arch/arm/core/cortex_m/vector_table.S
index c0a867b98b8..43a74b3ea04 100644
--- a/arch/arm/core/cortex_m/vector_table.S
+++ b/arch/arm/core/cortex_m/vector_table.S
@@ -36,8 +36,6 @@ rest should not be triggered until the kernel is ready to handle them.
 
 _ASM_FILE_PROLOGUE
 
-/* Diab requires a __start symbol */
-SECTION_SUBSEC_FUNC(exc_vector_table,_Start,__start)
 SECTION_SUBSEC_FUNC(exc_vector_table,_Start,_VectorTableROM)
 
     .word __CORTEXM_BOOT_MSP
diff --git a/include/linker-tool-gcc.h b/include/linker-tool-gcc.h
index 9031ef88fae..4c23884bacf 100644
--- a/include/linker-tool-gcc.h
+++ b/include/linker-tool-gcc.h
@@ -81,13 +81,9 @@ OUTPUT_ARCH(i386)
 #define SECTION_AT_PROLOGUE(name, options, align, addr) \
 	name options : align AT(addr)
 
-/* Diab-isms */
 #define SORT_BY_NAME(x) SORT(x)
 #define OPTIONAL
 
-/* see linker-tool-diab.h for description */
-#define PGALIGN_ALIGN(x) ALIGN(x)
-
 #define COMMON_SYMBOLS *(COMMON)
 
 #endif /* !__LINKER_TOOL_GCC_H */