diff --git a/src/core/envelope_and_lfo_parameters.cpp b/src/core/envelope_and_lfo_parameters.cpp
index 7735c000a..846ac3d86 100644
--- a/src/core/envelope_and_lfo_parameters.cpp
+++ b/src/core/envelope_and_lfo_parameters.cpp
@@ -38,9 +38,9 @@
 
 
 // how long should be each envelope-segment maximal (e.g. attack)?
-const float SECS_PER_ENV_SEGMENT = 5.0f;
+extern const float SECS_PER_ENV_SEGMENT = 5.0f;
 // how long should be one LFO-oscillation maximal?
-const float SECS_PER_LFO_OSCILLATION = 20.0f;
+extern const float SECS_PER_LFO_OSCILLATION = 20.0f;
 
 
 QVector<envelopeAndLFOParameters *> envelopeAndLFOParameters::s_EaLParametersInstances;
diff --git a/src/gui/widgets/envelope_and_lfo_view.cpp b/src/gui/widgets/envelope_and_lfo_view.cpp
index 52852f200..5815fcad6 100644
--- a/src/gui/widgets/envelope_and_lfo_view.cpp
+++ b/src/gui/widgets/envelope_and_lfo_view.cpp
@@ -50,10 +50,8 @@
 
 
 
-// how long should be each envelope-segment maximal (e.g. attack)?
-const float SECS_PER_ENV_SEGMENT = 5.0f;
-// how long should be one LFO-oscillation maximal?
-const float SECS_PER_LFO_OSCILLATION = 20.0f;
+extern const float SECS_PER_ENV_SEGMENT;
+extern const float SECS_PER_LFO_OSCILLATION;
 
 
 const int ENV_GRAPH_X = 6;