diff --git a/Strategic/strategicmap.cpp b/Strategic/strategicmap.cpp
index 6c5c6198..e3330f0c 100644
--- a/Strategic/strategicmap.cpp
+++ b/Strategic/strategicmap.cpp
@@ -5344,7 +5344,7 @@ FLOAT GetSAMMaxDistanceToCoveredSector( UINT8 usSam )
 			{
 				if ( ubSAMControlledSectors[y][x] & (1 << usSam) )
 				{
-					FLOAT dist = std::sqrt( FLOAT((sam_x - x)*(sam_x - x) + (sam_y - y)*(sam_y - y)) );
+					FLOAT dist = sqrt( FLOAT((sam_x - x)*(sam_x - x) + (sam_y - y)*(sam_y - y)) );
 
 					if ( maxdist < dist )
 						maxdist = dist;
@@ -5375,7 +5375,7 @@ BOOLEAN DoesSamCoverSector( UINT8 usSam, UINT8 usSector, BOOLEAN* apSamIsWorking
 					*apSamIsWorking = TRUE;
 			}
 
-			FLOAT dist = std::sqrt( FLOAT((SECTORX( samsector ) - SECTORX( usSector ))*(SECTORX( samsector ) - SECTORX( usSector )) + (SECTORY( samsector ) - SECTORY( usSector ))*(SECTORY( samsector ) - SECTORY( usSector ))) );
+			FLOAT dist = sqrt( FLOAT((SECTORX( samsector ) - SECTORX( usSector ))*(SECTORX( samsector ) - SECTORX( usSector )) + (SECTORY( samsector ) - SECTORY( usSector ))*(SECTORY( samsector ) - SECTORY( usSector ))) );
 
 			// determine max distance SAM has to cover
 			FLOAT sammaxdistance = GetSAMMaxDistanceToCoveredSector( usSam );
diff --git a/Tactical/Interface Control.cpp b/Tactical/Interface Control.cpp
index 91a45fe0..24febb72 100644
--- a/Tactical/Interface Control.cpp	
+++ b/Tactical/Interface Control.cpp	
@@ -3,6 +3,7 @@
 #else
 	#include <stdio.h>
 	#include <time.h>
+	#include <math.h>
 	#include "sgp.h"
 	#include "gameloop.h"
 	#include "himage.h"
@@ -636,7 +637,7 @@ void DrawExplosionWarning( INT32 sGridno, INT8 usLevel, INT8 usDelay )
 		{
 			for ( INT32 y = yl; y <= yh; ++y )
 			{
-				FLOAT diff = std::sqrt( (FLOAT)((sScreenX - x) * (sScreenX - x) + 2 * (sScreenY - y) * (sScreenY - y)) );
+				FLOAT diff = sqrt( (FLOAT)((sScreenX - x) * (sScreenX - x) + 2 * (sScreenY - y) * (sScreenY - y)) );
 
 				if ( radius_inner <= diff && diff <= radius_outer )
 				{