diff --git a/cpu/efm32/Makefile.include b/cpu/efm32/Makefile.include
index 54c4753fcb..c1ebc27df0 100644
--- a/cpu/efm32/Makefile.include
+++ b/cpu/efm32/Makefile.include
@@ -31,6 +31,9 @@ CFLAGS += -DCPU_FAM_$(call uppercase_and_underscore,$(CPU_FAM))
 # include EFM32 specific driver headers
 INCLUDES += -I$(RIOTCPU)/efm32/include/drivers
 
+# arm_math.h is required by vendor headers and is located in CMSIS DSP includes
+INCLUDES += -I$(PKGDIRBASE)/cmsis/CMSIS/DSP/Include
+
 # include cortexm_common
 LINKER_SCRIPT = cortexm.ld