diff --git a/src/minimodem.c b/src/minimodem.c
index b976f27..0d40383 100644
--- a/src/minimodem.c
+++ b/src/minimodem.c
@@ -31,7 +31,7 @@ band_mag( fftwf_complex * const cplx, unsigned int band, float scalar )
 {
     float re = cplx[band][0];
     float im = cplx[band][1];
-    float mag = hypot(re, im);
+    float mag = hypotf(re, im);
     return mag * scalar;
 }
 
diff --git a/src/tscope_print.c b/src/tscope_print.c
index 640cb36..595a077 100644
--- a/src/tscope_print.c
+++ b/src/tscope_print.c
@@ -26,7 +26,7 @@ band_mag( fftwf_complex * const cplx, unsigned int band, float scalar )
 {
     float re = cplx[band][0];
     float im = cplx[band][1];
-    float mag = hypot(re, im) * scalar;
+    float mag = hypotf(re, im) * scalar;
     return mag;
 }