diff --git a/rtengine/improcfun.cc b/rtengine/improcfun.cc
index 6721850c5..5b7daa3a1 100644
--- a/rtengine/improcfun.cc
+++ b/rtengine/improcfun.cc
@@ -257,9 +257,9 @@ void ImProcFunctions::ciecam_02 (CieImage* ncie, double adap, int begh, int endh
         int width = lab->W, height = lab->H;
         float minQ = 10000.f;
         float maxQ = -1000.f;
-        float w_h;
-        float a_w;
-        float c_;
+        float w_h = 0.f;
+        float a_w = 0.f;
+        float c_ = 0.f;
         float f_l;
         double Yw;
         Yw = 1.0;
diff --git a/rtengine/iplocallab.cc b/rtengine/iplocallab.cc
index a3637c2f2..3f8926fa8 100644
--- a/rtengine/iplocallab.cc
+++ b/rtengine/iplocallab.cc
@@ -4125,7 +4125,7 @@ void ImProcFunctions::Lab_Local (int call, int sp, float** shbuffer, LabImage *
             float **bufchro = nullptr;
             float **buflightslid = nullptr;
 
-            int bfh, bfw;
+            int bfh = 0.f, bfw = 0.f;
 
 
             float adjustr = 1.0f;
@@ -5254,12 +5254,12 @@ void ImProcFunctions::Lab_Local (int call, int sp, float** shbuffer, LabImage *
                         float Chprov1 = sqrtBuffer[x];
                         sincosval.y = sincosyBuffer[x];
                         sincosval.x = sincosxBuffer[x];
-                        float chr;
+                        float chr = 0.f;
 
 #else
                         float aa = transformed->a[y][x];
                         float bb = transformed->b[y][x];
-                        float HH, chr;
+                        float HH = 0.f, chr = 0.f;
 
                         if (needHH) { // only do expensive atan2 calculation if needed
                             HH = xatan2f (bb, aa);