diff --git a/Source/SupportFunctions/arm_float_to_q15.c b/Source/SupportFunctions/arm_float_to_q15.c
index e34089ed..76736d5b 100644
--- a/Source/SupportFunctions/arm_float_to_q15.c
+++ b/Source/SupportFunctions/arm_float_to_q15.c
@@ -69,6 +69,9 @@ void arm_float_to_q15(
     float32_t       maxQ = (float32_t) Q15_MAX;
     f32x4x2_t       tmp;
     q15x8_t         vecDst;
+#ifdef ARM_MATH_ROUNDING
+    float32_t in;
+#endif
 
 
     blkCnt = blockSize >> 3;
diff --git a/Source/SupportFunctions/arm_float_to_q31.c b/Source/SupportFunctions/arm_float_to_q31.c
index 8acd0b43..a4580f2b 100644
--- a/Source/SupportFunctions/arm_float_to_q31.c
+++ b/Source/SupportFunctions/arm_float_to_q31.c
@@ -72,6 +72,9 @@ void arm_float_to_q31(
     uint32_t         blkCnt;
     float32_t       maxQ = (float32_t) Q31_MAX;
     f32x4_t         vecDst;
+#ifdef ARM_MATH_ROUNDING
+    float32_t in;
+#endif
 
 
     blkCnt = blockSize >> 2U;
diff --git a/Source/SupportFunctions/arm_float_to_q7.c b/Source/SupportFunctions/arm_float_to_q7.c
index 3833e8b6..80eb294a 100644
--- a/Source/SupportFunctions/arm_float_to_q7.c
+++ b/Source/SupportFunctions/arm_float_to_q7.c
@@ -70,6 +70,9 @@ void arm_float_to_q7(
     q15x8_t         evVec, oddVec;
     q7x16_t         vecDst;
     float32_t const *pSrcVec;
+#ifdef ARM_MATH_ROUNDING
+    float32_t in;
+#endif
 
     pSrcVec = (float32_t const *) pSrc;
     blkCnt = blockSize >> 4;