diff --git a/libraries/dsp/cmsis_dsp/SupportFunctions/math_helper.c b/libraries/dsp/cmsis_dsp/SupportFunctions/math_helper.c
index dbf2cfe1bc..522f5a6762 100644
--- a/libraries/dsp/cmsis_dsp/SupportFunctions/math_helper.c
+++ b/libraries/dsp/cmsis_dsp/SupportFunctions/math_helper.c
@@ -164,7 +164,8 @@ void arm_float_to_q12_20(float *pIn, q31_t * pOut, uint32_t numSamples)
 uint32_t arm_compare_fixed_q15(q15_t *pIn, q15_t * pOut, uint32_t numSamples)
 {
   uint32_t i; 
-  int32_t diff, diffCrnt = 0;
+  int32_t diff;
+  uint32_t diffCrnt = 0;
   uint32_t maxDiff = 0;
 
   for (i = 0; i < numSamples; i++)
@@ -192,7 +193,8 @@ uint32_t arm_compare_fixed_q15(q15_t *pIn, q15_t * pOut, uint32_t numSamples)
 uint32_t arm_compare_fixed_q31(q31_t *pIn, q31_t * pOut, uint32_t numSamples)
 {
   uint32_t i; 
-  int32_t diff, diffCrnt = 0;
+  int32_t diff;
+  uint32_t diffCrnt = 0;
   uint32_t maxDiff = 0;
 
   for (i = 0; i < numSamples; i++)